W921E400A Datasheet, PDF (9/53 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E400A/W921C400
6.2 RAM Memory Map
000H
000
Speical Control Register
03FH
040H
Working Register
04FH
050H
Serial Buffer Register
07FH
080H
Stack Register or
General Register
0FFH
100H
Serial Buffer Register or
063
064
079
080 _Stack
Register
127
128 _{(040H to}
0FFH)
Serial
Buffer
Register
General
255
(050H to
14EH)
Register
256
(040H to
1FFH)
General Register
17FH
383
180H
384
General Register
1FFH
511
6.2.1 Special Control Register Area
There are 64 × 4-bit registers in the special control register area. All control registers such as DTMF
control register, serial speed control register, ..., etc. are in this area. Refer to the following table for
detailed register map.
ADDR.
000H
001H
002H
003H
004H
005H
006H
007H
008H
DESCRIPTION
Reserved
Reserved
Reserved
Port P4 Pull High Resistor Register
Port P4 Output Type Register
Port P6 Pull High Resistor Register
Port P6 Output Type Register
Port PAB Pull High Resistor Register
Port PAB Output Type Register
ABBREVIATION
(P4PH)
(P4TP)
(P6PH)
(P6TP)
(PABPH)
(PABTP)
INITIAL VALUE
-
-
-
00H
00H
00H
00H
00H
00H
Publication Release Date: July 1999
-9-
Revision A3