參數(shù)資料
型號: ST7265
英文描述: ST7 - LOW-POWER. FULL-SPEED USB 8-BIT MCU WITH 32K FLASH. 5K RAM. FLASH CARD I/F. TIMER. PWM. ADC. I2C
中文描述: ST7的-低功耗。全速USB 8位32K快閃微控制器。 5K內(nèi)存。閃存卡的I /樓計時器。脈寬調(diào)制。 ADC的。的I2C
文件頁數(shù): 21/166頁
文件大?。?/td> 2089K
代理商: ST7265
ST7265x
117/166
IC SINGLE MASTER BUS INTERFACE (Cont’d)
I2C CLOCK CONTROL REGISTER (CCR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7 = FM/SM
Fast/Standard I2C mode.
This bit is set and cleared by software. It is not
cleared when the interface is disabled (PE=0).
0: Standard I2C mode
1: Fast I2C mode
Bit 6:0 = CC6-CC0
7-bit clock divider.
These bits select the speed of the bus (FSCL) de-
pending on the I2C mode. They are not cleared
when the interface is disabled (PE=0).
– Standard mode (FM/SM=0): FSCL <= 100kHz
FSCL = FCPU/(2x([CC6..CC0]+2))
– Fast mode (FM/SM=1): FSCL > 100kHz
FSCL = FCPU/(3x([CC6..CC0]+2))
Note: The programmed FSCL assumes no load on
SCL and SDA lines.
I2C DATA REGISTER (DR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D7-D0
8-bit Data Register.
These bits contains the byte to be received or
transmitted on the bus.
– Transmitter mode: Byte transmission start auto-
matically when the software writes in the DR reg-
ister.
– Receiver mode: the first data byte is received au-
tomatically in the DR register using the least sig-
nificant bit of the address.
Then, the next data bytes are received one by
one after reading the DR register.
Table 34. I2C Register Map
70
FM/SM
CC6
CC5
CC4
CC3
CC2
CC1
CC0
70
D7
D6
D5
D4
D3
D2
D1
D0
Address
(Hex.)
Register
Name
76
5
4
32
10
40
CR
Reset Value
0
PE
00
START
0
ACK
0
STOP
0
ITE
0
41
SR1
Reset Value
EVF
00
TRA
00
BTF
00
M/IDL
0
SB
0
42
SR2
Reset Value
0
AF
00
0
43
CCR
Reset Value
FM/SM
0
CC6
0
CC5
0
CC4
0
CC3
0
CC2
0
CC1
0
CC0
0
46
DR
Reset Value
DR7
0
DR6
0
DR5
0
DR4
0
DR3
0
DR2
0
DR1
0
DR0
0
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