W79E825A Datasheet, PDF (36/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
I2C ADDRESS REGISTER
Bit: 7
6
5
4
3
2
1
0
I2ADDR.7 I2ADDR.6 I2ADDR.5 I2ADDR.4 I2ADDR.3 I2ADDR.2 I2ADDR.1 GC
Mnemonic: I2ADDR
Address: C1h
BIT
NAME
FUNCTION
I2C Address register:
The 8051 uC can read from and write to this 8-bit, directly addressable
7~1 I2ADDR.[7:1] ^{SFR. The content of this register is irrelevant when I2C is in master mode.}
In the slave mode, the seven most significant bits must be loaded with the
MCU’s own address. The I2C hardware will react if either of the address is
matched.
0 GC
General Call Function.
0: Disable General Call Function.
1: Enable General Call Function.
NVM ADDRESS
Bit: 7
6
5
4
3
2
1
0
NVMADDR.7 NVMADDR.6 NVMADDR.5 NVMADDR.4 NVMADDR.3 NVMADDR.2NVMADDR.1 NVMADDR.0
Mnemonic: NVMADDR
Address: C6h
BIT
NAME
FUNCTION
The NVM address:
7~0 NVMADDR.[7:0] _{The register indicates NVM data memory of low byte address on On-Chip}
code memory space.
TIMED ACCESS
Bit: 7
6
5
4
3
2
1
0
TA.7
TA.6
TA.5
TA.4
TA.3
TA.2
TA.1
TA.0
Mnemonic: TA
Address: C7h
BIT NAME
FUNCTION
7-0 TA.[7:0]
The Timed Access register:
The Timed Access register controls the access to protected bits. To access
protected bits, the user must first write AAH to the TA. This must be immediately
followed by a write of 55H to TA. Now a window is opened in the protected bits
for three machine cycles, during which the user can write to these bits.
NVM CONTROL
Bit: 7
6
5
4
3
2
1
0
EER
EWR
-
-
-
-
-
-
Mnemonic: NVMCON
Address: CEh
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