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| 鍨嬭櫉锛� | PIC16F737-E/SS |
| 寤犲晢锛� | Microchip Technology |
| 鏂囦欢闋佹暩(sh霉)锛� | 83/231闋� |
| 鏂囦欢澶у皬锛� | 0K |
| 鎻忚堪锛� | IC PIC MCU FLASH 4KX14 28SSOP |
| 妯欐簴鍖呰锛� | 47 |
| 绯诲垪锛� | PIC® 16F |
| 鏍稿績铏曠悊鍣細 | PIC |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 20MHz |
| 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/寰�(f霉)浣嶏紝POR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 25 |
| 绋嬪簭瀛樺劜鍣ㄥ閲忥細 | 7KB锛�4K x 14锛� |
| 绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 | 闁冨瓨 |
| RAM 瀹归噺锛� | 368 x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 4 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 ~ 125°C |
| 灏佽/澶栨锛� | 28-SSOP锛�0.209"锛�5.30mm 瀵級 |
| 鍖呰锛� | 绠′欢 |
| 閰嶇敤锛� | I3DBF777-ND - BOARD DAUGHTER ICEPIC3 |
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2009 Microchip Technology Inc.
DS39636D-page 179
PIC18F2X1X/4X1X
16.4.7
BAUD RATE
In I2C Master mode, the Baud Rate Generator (BRG)
reload value is placed in the lower 7 bits of the
SSPADD register (Figure 16-17). 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 16-3 demonstrates clock rates based on
instruction cycles and the BRG value loaded into
SSPADD.
FIGURE 16-17:
BAUD RATE GENERATOR BLOCK DIAGRAM
TABLE 16-3:
I2C CLOCK RATE W/BRG
SSPM3:SSPM0
BRG Down Counter
CLKO
FOSC/4
SSPADD<6:0>
SSPM3:SSPM0
SCL
Reload
Control
Reload
FOSC
FCY
FCY * 2
BRG Value
FSCL
(2 Rollovers of BRG)
40 MHz
10 MHz
20 MHz
18h
400 kHz(1)
40 MHz
10 MHz
20 MHz
1Fh
312.5 kHz
40 MHz
10 MHz
20 MHz
63h
100 kHz
16 MHz
4 MHz
8 MHz
09h
400 kHz(1)
16 MHz
4 MHz
8 MHz
0Ch
308 kHz
16 MHz
4 MHz
8 MHz
27h
100 kHz
4 MHz
1 MHz
2 MHz
02h
333 kHz(1)
4 MHz
1 MHz
2 MHz
09h
100 kHz
4 MHz
1 MHz
2 MHz
00h
1 MHz(1)
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.
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