UPD78320 Datasheet, PDF (29/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
Table 2-2. List of Special Function Registers (4/4)
Address Special Function Register (SFR) Name
Symbol
R/W
FFF0H
FFF1H
FFF2H
FFF3H
FFF4H
FFF5H
FFF8H
FFF9H
Context switching enable register 0L
Context switching enable register 0H
Context switching enable register 1L
––
External interupt mode register 0
External interupt mode register 1
In-service priority register
Priority specify register
CSE0L
CSE0
CSE0H
CSE1L
CSE1
––
INTM0
INTM1
ISPR
PRSL
R/W
R
R/W
Manipulable Bit Unit
1 bit 8 bits 16 bits
q
q
q
q
q
q
q
q
––
––
q
q
––
q
q
––
––
q
––
q
q
––
On Reset
00H
––
00H
2.3 DATA MEMORY ADDRESSING
In the µPD78322, the internal RAM space (FC80H to FEFFH) and the special function register area (FF00H to FFFFH)
are mapped in the FC80H to FFFFH area. In the FE20H to FF1FH space of the data memory, short direct addressing enables
direct addressing by 1-byte data in an instruction word.
Figure 2-6. Data Memory Addressing
FFFFH
FF1FH
FF00H
FEFFH
FE80H
FE20H
Special Function Register
(SFR)
General Register
SFR Addressing
Register Addressing
FE00H
FDFFH
Main RAM
Peripheral RAM
FC80H
External Memory
Short Direct Addressing
Direct Addressing
Register Indirect Addressing
Based Addressing
Based Indexed Addressing
Based Indexed Addressing
(Provided with Displacement)
3FFFH
Internal ROM^Note
0000H
Note When EA = L, or with the µPD78320, this is external memory.
Caution For word access (including stack operations) to the main RAM area (FE00H-FEFFH), the address that
specifies the operand must be an even value.
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