W79E225A Datasheet, PDF (67/200 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/227A Data Sheet
I2C BAUD RATE CONTROL REGISTER
Bit:
7
6
5
I2CLK.7 I2CLK.6 I2CLK.5
Mnemonic: I2CLK
BIT NAME
7-0 I2CLK
I2C clock rate control.
4
I2CLK.4
3
I2CLK.3
FUNCTION
2
1
I2CLK.2 I2CLK.1
Address: EEh
0
I2CLK.0
I2C TIMER COUNTER REGISTER
Bit:
7
6
5
4
3
2
1
0
-
-
-
-
-
ENTI
DIV4
TIF
Mnemonic: I2TIMER
Address: EFh
BIT NAME
FUNCTION
7-3 -
Reserved.
2 ENTI
Enable I2C 14-bits Time-out Counter. Setting ENTI to logic high will firstly reset
the time-out counter and then start up counting. Clearing ENTI disables the 14-
bit time-out counter. ENTI can be set to logic high only when SI=0.
1 DIV4
I2C Time-out Counter Clock Frequency Selection.
0 = the clock frequency is coherent to the system clock Fosc.
1 = the clock frequency is Fosc/4.
0 TIF
I2C Time-out Flag. When the time-out counter overflows hardware will set this
flag and request the I2C interrupt if I2C interrupt is enabled (EI2C=1). This bit
must be cleared by software.
B REGISTER
Bit:
7
6
5
4
3
2
1
0
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
Mnemonic: B
Address: F0h
BIT NAME
FUNCTION
7-0 B
The B register is the standard 8032 accumulator.
SERIAL PERIPHERAL CONTROL REGISTER
Bit:
7
6
5
4
3
2
1
0
SSOE
Mnemonic: SPCR
SPE
LSBFE MSTR
CPOL
CPHA
Address:
SPR1
SPR0
F3h
- 67 -
Publication Release Date: December 14, 2007
Revision A2.0