UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 88

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

88
• Software example
Remark
RAMD
R_BNKA:
R_BNKN:
R_BNKRN: DS
RSAVEAX: DS
ETRC
ENTRY:
BNKC
BNKCAL:
BNKCALS:
BN3
TEST:
END
In the software example above, multiplexed processing is not supported.
CSEG
DSEG
DS
DS
MOV
MOVW
CALL
CSEG
MOVW
MOV
XCH
MOV
CALL
MOVW
XCH
MOV
MOVW
RET
MOVW
PUSH
MOVW
RET
CSEG
MOV ⋅⋅⋅
RET
:
:
CHAPTER 4 MEMORY BANK SELECT FUNCTION (
SADDR
2
1
1
2
UNIT
R_BNKN,#BANKNUM TEST
R_BNKA,#TEST
!BNKCAL
AT
RSAVEAX,AX
A,R_BNKN
A,BANK
R_BNKRN,A
!BNKCALS
RSAVEAX,AX
A,R_BNKRN
BANK,A
RSAVEAX,AX
AX,R_BNKA
AX
AX,RSAVEAX
AX
BANK3
:
:
7000H
User’s Manual U17554EJ4V0UD
; Secures RAM for specifying an address at the calling destination.
; Secures RAM for specifying a memory bank number at the calling destination.
; Secures RAM for saving a memory bank number at the calling source.
; Stores the address at the calling destination in RAM.
; Branches to an inter-memory bank calling processing routine.
; Specifies the memory bank number at the calling source.
; Returns to the calling source.
; Specifies the address at the calling destination.
;
; Secures RAM for saving the AX register.
; Store the memory bank number at the calling destination in RAM.
; Inter-memory bank calling processing routine
; Saves the AX register.
; Acquires the memory bank number at the calling destination.
; Changes the bank and acquires the memory bank number at the calling source.
; Saves the memory bank number at the calling source to RAM.
; Calls a subroutine to branch to the calling destination.
; Saves the AX register.
; Acquires the memory bank number at the calling source.
; Restores the AX register.
; Sets the address at the calling destination to stack.
; Restores source AX register.
; Branches to the calling destination.
PD78F0889, 78F0890 ONLY)