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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | PIC18LF4420-I/ML |
| 寤犲晢锛� | Microchip Technology |
| 鏂囦欢闋�(y猫)鏁�(sh霉)锛� | 10/151闋�(y猫) |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC MCU FLASH 8KX16 44QFN |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 45 |
| 绯诲垪锛� | PIC® 18F |
| 鏍稿績铏曠悊鍣細 | PIC |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 40MHz |
| 閫ｉ€氭€э細 | I²C锛孲PI锛孶ART/USART |
| 澶栧湇瑷�(sh猫)鍌欙細 | 娆犲妾㈡脯(c猫)/寰�(f霉)浣�锛孒LVD锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 36 |
| 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� | 2 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 13x10b |
| 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� | 44-VQFN 瑁搁湶鐒婄洡(p谩n) |
| 鍖呰锛� | 绠′欢 |
| 鐢�(ch菐n)鍝佺洰閷勯爜(y猫)闈細 | 643 (CN2011-ZH PDF) |
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PIC16(L)F1782/3
DS41579C-page 278
Preliminary
2011-2012 Microchip Technology Inc.
26.4
I2C
MODE OPERATION
All MSSP I2C communication is byte oriented and
shifted out MSb first. Six SFR registers and 2 interrupt
flags interface the module with the PIC microcon-
troller and user software. Two pins, SDA and SCL, are
exercised by the module to communicate with other
external I2C devices.
26.4.1
BYTE FORMAT
All communication in I2C is done in 9-bit segments. A
byte is sent from a master to a slave or vice-versa, fol-
lowed by an Acknowledge bit sent back. After the 8th
falling edge of the SCL line, the device outputting data
on the SDA changes that pin to an input and reads in
an acknowledge value on the next clock pulse.
The clock signal, SCL, is provided by the master. Data
is valid to change while the SCL signal is low, and
sampled on the rising edge of the clock. Changes on
the SDA line while the SCL line is high define special
conditions on the bus, explained below.
26.4.2
DEFINITION OF I2C TERMINOLOGY
There is language and terminology in the description
of I2C communication that have definitions specific to
I2C. That word usage is defined below and may be
used in the rest of this document without explanation.
This table was adapted from the Philips I2C
specification.
26.4.3
SDA AND SCL PINS
Selection of any I2C mode with the SSPEN bit set,
forces the SCL and SDA pins to be open-drain. These
pins should be set by the user to inputs by setting the
appropriate TRIS bits.
26.4.4
SDA HOLD TIME
The hold time of the SDA pin is selected by the SDAHT
bit of the SSPCON3 register. Hold time is the time SDA
is held valid after the falling edge of SCL. Setting the
SDAHT bit selects a longer 300 ns minimum hold time
and may help on buses with large capacitance.
TABLE 26-2:
I2C BUS TERMS
Note:
Data is tied to output zero when an I2C
mode is enabled.
TERM
Description
Transmitter
The device which shifts data out
onto the bus.
Receiver
The device which shifts data in
from the bus.
Master
The device that initiates a transfer,
generates clock signals and termi-
nates a transfer.
Slave
The device addressed by the mas-
ter.
Multi-master
A bus with more than one device
that can initiate data transfers.
Arbitration
Procedure to ensure that only one
master at a time controls the bus.
Winning arbitration ensures that
the message is not corrupted.
Synchronization Procedure to synchronize the
clocks of two or more devices on
the bus.
Idle
No master is controlling the bus,
and both SDA and SCL lines are
high.
Active
Any time one or more master
devices are controlling the bus.
Addressed
Slave
Slave device that has received a
matching address and is actively
being clocked by a master.
Matching
Address
Address byte that is clocked into a
slave that matches the value
stored in SSPADD.
Write Request
Slave receives a matching
address with R/W bit clear, and is
ready to clock in data.
Read Request
Master sends an address byte with
the R/W bit set, indicating that it
wishes to clock data out of the
Slave. This data is the next and all
following bytes until a Restart or
Stop.
Clock Stretching When a device on the bus hold
SCL low to stall communication.
Bus Collision
Any time the SDA line is sampled
low by the module while it is out-
putting and expected high state.
鐩搁棞(gu膩n)PDF璩囨枡 |
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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 |
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| PIC18LF4420T-I/ML | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16KB 768 RAM 36I/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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| PIC18LF4423-I/ML | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 44-pin 16KB 768bytes -RAM 36I/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 |
| PIC18LF4423-I/P | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16KB 768bytes- RAM 36I/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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