W78IRD2 Datasheet, PDF (15/76 Pages) Winbond – 8-BIT MICROCONTROLLER

W78IRD2
Serial Data Buffer
Bit:
7
6
5
4
3
2
1
0
SBUF.7 SBUF.6 SBUF.5 SBUF.4 SBUF.3 SBUF.2 SBUF.1 SBUF.0
Mnemonic: SBUF
Address: 99h
BIT NAME
FUNCTION
Serial port data is read from or written to this location. It actually consists of two
7~0
SBUF
separate, internal 8-bit registers, the receive register and the transmit buffer. Any read
access reads data from the receive register, while write access writes to the transmit
buffer.
Port 2
Bit:
7
6
P2.7 P2.6
Mnemonic: P2
5
P2.5
4
P2.4
Address: A0h
3
P2.3
2
P2.2
1
P2.1
0
P2.0
Ram High Byte Address
Bit:
7
6
5
4
3
0
0
0
0
0
Mnemonic: XRAMAH Address: A1h
The AUX-RAM high byte address
Auxiliary 1 Register
Bit:
7
6
5
4
3
-
-
-
-
GF2
Mnemonic: AUXR1 Address: A2h
2
1
0
0 ^{XRAMAH.1 XRAMAH.0}
2
1
0
0
-
DPS
BIT
NAME
FUNCTION
7~4
-
Reserved
3
GF2 General purpose, user–defined flag.
2
0
The bit cannot be written and is always read as 0.
1
-
Reserved
0 = switch to DPTR0
0
DPS
1 = switch to DPTR1
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Publication Release Date: October 2, 2006
Revision A7