W79E225A_08 Datasheet, PDF (56/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
BIT NAME
7 CY
6 _AC
5 F0
4-3 RS.1-0
2 OV
1 F1
0P
FUNCTION
Carry flag. Set for an arithmetic operation which results in a carry being
generated from the ALU. It is also used as the accumulator for the bit operations.
Auxiliary carry: Set when the previous operation resulted in a carry (during
addition) or a borrow (during subtraction) from the high order nibble.
User flag 0. A general purpose flag that can be set or cleared by the by software.
Register bank selects bits:
RS1 RS2 Register Bank
000
011
102
113
Address
00-07h
08-0Fh
10-17h
18-1Fh
Overflow flag. Set when a carry was generated from the seventh bit but not from
the 8th bit as a result of the previous operation or vice-versa.
User Flag 1. General purpose flag that can be set or cleared by the user by
software.
Parity flag. Set/cleared by hardware to indicate odd/even number of 1's in the
accumulator.
PWMP COUNTER HIGH BITS REGISTER
Bit:
7
6
5
4
3
2
1
-
-
-
-
PWMP.11 PWMP.10 PWMP.9
Mnemonic: PWMPH
Address: D1h
BIT
NAME
FUNCTION
7-4 -
Reserved.
3-0 PWMP.11~PWMP.8 PWM Counter Register bits 11~8.
0
PWMP.8
PWM 0 HIGH BITS REGISTER
Bit:
7
6
5
-
-
-
Mnemonic: PWM0H
4
-
3
2
1
0
PWM0.11 PWM0.10 PWM0.9 PWM0.8
Address: D2h
BIT NAME
7~4 -
3~0
PWM0.11
~PWM0.8
Reserved.
The PWM 0 Register bit 11~8.
FUNCTION
NVM DATA
Bit:
7
6
5
4
3
2
1
0
NVMDAT.7 NVMDAT.6 NVMDAT.5 NVMDAT.4 NVMDAT.3 NVMDAT.2 NVMDAT.1 NVMDAT.0
Mnemonic: NVMDAT
Address: D3h
- 56 -
Publication Release Date: April 15, 2008
Revision A4.0