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鍨嬭櫉(h脿o)锛� PIC18F4455-I/P
寤犲晢锛� Microchip Technology
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鏍稿績铏曠悊鍣細 PIC
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鐢�(ch菐n)鍝佺洰閷勯爜(y猫)闈細 646 (CN2011-ZH PDF)
閰嶇敤锛� I3-DB18F4550-ND - BOARD DAUGHTER ICEPIC3
DM163025-ND - PIC DEM FULL SPEED USB DEMO BRD
DVA18XP400-ND - DEVICE ADAPTER 18F4220 PDIP 40LD
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
ACICE0206-ND - ADAPTER MPLABICE 40P 600 MIL
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PIC18F2455/2550/4455/4550
DS39632E-page 228
2009 Microchip Technology Inc.
19.4.7
BAUD RATE
In I2C Master mode, the Baud Rate Generator (BRG)
reload value is placed in the lower seven bits of the
SSPADD register (Figure 19-19). When a write occurs
to SSPBUF, the Baud Rate Generator will automatically
begin counting. The BRG counts down to 鈥�0鈥� and stops
until another reload has taken place. The BRG count is
decremented twice per instruction cycle (TCY) on the
Q2 and Q4 clocks. In I2C Master mode, the BRG is
reloaded automatically.
Once the given operation is complete (i.e., transmis-
sion of the last data bit is followed by ACK), the internal
clock will automatically stop counting and the SCL pin
will remain in its last state.
Table 19-3 demonstrates clock rates based on
instruction cycles and the BRG value loaded into
SSPADD. SSPADD values of less than 2 are not
supported. Due to the need to support I2C clock
stretching capability, I2C baud rates are partially
dependent upon system parameters, such as line
capacitance and pull-up strength. The parameters
provided in Table 19-3 are guidelines, and the actual
baud rate may be slightly slower than that predicted in
the table. The baud rate formula shown in the bit
description of Register 19-4 sets the maximum baud
rate that can occur for a given SSPADD value.
FIGURE 19-19:
BAUD RATE GENERATOR BLOCK DIAGRAM
TABLE 19-3:
I2C CLOCK RATE W/BRG
SSPM3:SSPM0
BRG Down Counter
CLKO
FOSC/4
SSPADD<6:0>
SSPM3:SSPM0
SCL
Reload
Control
Reload
FCY
FCY * 2
BRG Value
FSCL
(2 Rollovers of BRG)
10 MHz
20 MHz
18h
400 kHz(1)
10 MHz
20 MHz
1Fh
312.5 kHz
10 MHz
20 MHz
63h
100 kHz
4 MHz
8 MHz
09h
400 kHz(1)
4 MHz
8 MHz
0Ch
308 kHz
4 MHz
8 MHz
27h
100 kHz
1 MHz
2 MHz
02h
333 kHz(1)
1 MHz
2 MHz
09h
100 kHz
Note 1:
The I2C interface does not conform to the 400 kHz I2C specification (which applies to rates greater than
100 kHz) in all details, but may be used with care where higher rates are required by the application.
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
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鍙冩暩(sh霉)鎻忚堪
PIC18F4455T-I/ML 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 24kBF 2048RM FSUSB2 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
PIC18F4455T-I/PT 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 24kBF 2048RM FSUSB2 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
PIC18F4458-I/ML 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 24KB Flash 2KB RAM 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
PIC18F4458-I/P 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 24KB Flash 2KB RAM 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
PIC18F4458-I/PT 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 24KB Flash 2KB RAM 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