µPD17230, 17231, 17232, 17233, 17234, 17235, 17236
2.4.2 System registers (SYSREG)
The system registers are registers that are directly related to control of the CPU. These registers are mapped to
addresses 74H-7FH on the data memory and can be referenced regardless of bank specification.
The system registers include the following registers:
• Address registers (AR0-AR3)
• Window register (WR)
• Bank register (BANK)
• Memory pointer enable flag (MPE)
• Memory pointers (MPH, MPL)
• Index registers (IXH, IXM, IXL)
• General register pointers (RPH, RPL)
• Program status word (PSWORD)
Figure 2-7. Configuration of System Register
Address 74H 75H 76H 77H 78H 79H 7AH 7BH 7CH 7DH 7EH 7FH
Name
Address register
(AR)
Window Bank
register register
(WR) (BANK)
Index register
(IX)
Data memory
row address
pointer (MP)
General
register
pointer
(RP)
Program
status
word
(PSWORD)
IXH
IXM
Symbol AR 3 AR 2 AR 1 AR 0 WR BANK
IXL RPH RPL PSW
MPH MPL
Bit b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0
Data
0 0 (AR) (µPD17234,17235,17236)
0 0 0 (AR) (µPD17232,17233)
0000
(AR) (µPD17231)
0 0 0 0 0 (AR) (µPD17230)
(WR)
(BANK) M
000 P00 0
E
(IX)
(MP)
(RP) B C C I
000
CMY Z X
DP
E
Initial
Value
At
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Undefined 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Data Sheet U14360EJ1V0DS00
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