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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | PIC18F14K50-I/SS |
| 寤犲晢锛� | Microchip Technology |
| 鏂囦欢闋�(y猫)鏁�(sh霉)锛� | 68/285闋�(y猫) |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC PIC MCU FLASH 8KX16 20-SSOP |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | XLP Deep Sleep Mode 8-bit PIC® Microcontroller Portfolio |
| 瑕栭牷鏂囦欢锛� | World's Lowest Power in Sleep MCU: nanoWatt XLP |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 67 |
| 绯诲垪锛� | PIC® XLP™ 18F |
| 鏍稿績铏曠悊鍣細 | PIC |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 48MHz |
| 閫ｉ€氭€э細 | I²C锛孲PI锛孶ART/USART锛孶SB |
| 澶栧湇瑷�(sh猫)鍌欙細 | 娆犲妾㈡脯(c猫)/寰�(f霉)浣�锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 14 |
| 绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 | 16KB锛�8K x 16锛� |
| 绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 | 闁冨瓨 |
| EEPROM 澶у皬锛� | 256 x 8 |
| RAM 瀹归噺锛� | 768 x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 1.8 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 11x10b |
| 鎸暕鍣ㄥ瀷锛� | 鍏�(n猫i)閮� |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 灏佽/澶栨锛� | 20-SSOP锛�0.209"锛�5.30mm 瀵級 |
| 鍖呰锛� | 绠′欢 |
| 鐢�(ch菐n)鍝佺洰閷勯爜(y猫)闈細 | 656 (CN2011-ZH PDF) |
| 閰嶇敤锛� | AC244023-ND - PROC EXTENS PAK PIC18F1XK50 DV164126-ND - KIT DEVELOPMENT USB W/PICKIT 2 DM164127-ND - KIT DEVELOPMENT USB 18F14/13K50 AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP XLT20SS-1-ND - SOCKET TRANSITION 18DIP 20SSOP AC164307-ND - MODULE SKT FOR PM3 28SSOP |
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dsPIC30F1010/202X
DS70178C-page 158
Preliminary
2006 Microchip Technology Inc.
14.12.3
BAUD RATE GENERATOR
In I2C Master mode, the reload value for the BRG is
located in the I2CBRG register. When the BRG is
loaded with this value, the BRG counts down to 鈥�0鈥� and
stops until another reload has taken place. If clock
arbitration is taking place, for instance, the BRG is
reloaded when the SCL pin is sampled high.
As per the I2C standard, FSCK may be 100 kHz or
400 kHz. However, the user can specify any baud rate
up to 1 MHz. I2CBRG values of 鈥�0鈥� or 鈥�1鈥� are illegal.
EQUATION 14-1:
I2CBRG VALUE
14.12.4
CLOCK ARBITRATION
Clock arbitration occurs when the master deasserts the
SCL pin (SCL allowed to float high) during any receive,
transmit or Restart/Stop condition. When the SCL pin is
allowed to float high, the Baud Rate Generator is
suspended from counting until the SCL pin is actually
sampled high. When the SCL pin is sampled high, the
Baud Rate Generator is reloaded with the contents of
I2CBRG and begins counting. This ensures that the
SCL high time will always be at least one BRG rollover
count in the event that the clock is held low by an
external device.
14.12.5
MULTI-MASTER COMMUNICATION,
BUS COLLISION AND BUS
ARBITRATION
Multi-Master operation support is achieved by bus
arbitration. When the master outputs address/data bits
onto the SDA pin, arbitration takes place when the
master outputs a 鈥�1鈥� on SDA, by letting SDA float high
while another master asserts a 鈥�0鈥�. When the SCL pin
floats high, data should be stable. If the expected data
on SDA is a 鈥�1鈥� and the data sampled on the SDA
pin = 0, then a bus collision has taken place. The
master will set the MI2CIF pulse and reset the master
portion of the I2C port to its Idle state.
If a transmit was in progress when the bus collision
occurred, the transmission is halted, the TBF flag is
cleared, the SDA and SCL lines are deasserted, and a
value can now be written to I2CTRN. When the user
services the I2C master event Interrupt Service
Routine, if the I2C bus is free (i.e., the P bit is set) the
user can resume communication by asserting a Start
condition.
If a Start, Restart, Stop or Acknowledge condition was
in progress when the bus collision occurred, the condi-
tion is aborted, the SDA and SCL lines are deasserted,
and the respective control bits in the I2CCON register
are cleared to 鈥�0鈥�. When the user services the bus col-
lision Interrupt Service Routine, and if the I2C bus is
free, the user can resume communication by asserting
a Start condition.
The Master will continue to monitor the SDA and SCL
pins and, if a Stop condition occurs, the MI2CIF bit will
be set.
A write to the I2CTRN will start the transmission of data
at the first data bit, regardless of where the transmitter
left off when bus collision occurred.
In a Multi-Master environment, the interrupt generation
on the detection of Start and Stop conditions allows the
determination of when the bus is free. Control of the I2C
bus can be taken when the P bit is set in the I2CSTAT
register, or the bus is Idle and the S and P bits are
cleared.
14.13 I2C Module Operation During CPU
Sleep and Idle Modes
14.13.1
I2C OPERATION DURING CPU
SLEEP MODE
When the device enters Sleep mode, all clock sources
to the module are shutdown and stay at logic 鈥�0鈥�. If
Sleep occurs in the middle of a transmission, and the
state machine is partially into a transmission as the
clocks stop, then the transmission is aborted. Similarly,
if Sleep occurs in the middle of a reception, then the
reception is aborted.
14.13.2
I2C OPERATION DURING CPU IDLE
MODE
For the I2C, the I2CSIDL bit selects if the module will
stop on Idle or continue on Idle. If I2CSIDL = 0, the
module will continue operation on assertion of the Idle
mode. If I2CSIDL = 1, the module will stop on Idle.
I2CBRG
Fcy
Fscl
-----------
Fcy
1 111 111
,,
---------------------------
鈥�
1
鈥�
=
鐩搁棞(gu膩n)PDF璩囨枡 |
PDF鎻忚堪 |
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
鍙冩暩(sh霉)鎻忚堪 |
|---|---|
| PIC18F14K50T-I/SO | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16KB Flash 768 RAM15 I/O 10-B ADC USB 2.0 RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18F14K50T-I/SS | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16KB Flash 768 RAM15 I/O 10-B ADC USB 2.0 RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18F2220-E/SO | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 4KB 512 RAM 25 I/O RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18F2220-E/SP | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 4KB 512 RAM 25 I/O RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18F2220-I/SO | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 4KB 512 RAM 25 I/O RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
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