UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 86

• 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

86
• Software example 1 (to branch from all areas)
• Software example 2 (to branch from common area to any bank area)
RAMD
R_BNKA:
R_BNKN:
RSAVEAX: DS
ETRC
ENTRY:
BNKC
BNKBR:
BN3
TEST:
END
ETRC
ENTRY:
BN3
TEST:
END
CSEG
CSEG
MOV
BR
CSEG
MOV ⋅⋅⋅
DSEG
DS
DS
MOV
MOVW
BR
CSEG
MOVW
MOV
MOV
MOVW
PUSH
MOVW
RET
CSEG
MOV ⋅⋅⋅
:
:
:
:
:
:
CHAPTER 4 MEMORY BANK SELECT FUNCTION (
SADDR
2
1
2
UNIT
R_BNKN,#BANKNUM TEST
R_BNKA,#TEST
!BNKBR
AT
RSAVEAX,AX
A,R_BNKN
BANK,A
AX,R_BNKA
AX
AX,RSAVEAX
BANK3
AT
R_BNKN,#BANKNUM TEST
!TEST
BANK3
7000H
2000H
User’s Manual U17554EJ4V0UD
; Secures RAM for specifying a memory bank at the branch destination.
; Secures RAM for specifying a memory bank number at the branch destination.
; Stores the address at the branch destination in RAM.
; Specifies the address at the branch destination.
; Sets the address at the branch destination to stack.
; Branch
; Secures RAM for saving the AX register.
; Stores the memory bank number at the branch destination in RAM.
; Branches to inter-memory bank branch processing.
;
; Saves the AX register.
; Acquires the memory bank number at the branch destination.
; Specifies the memory bank number at the branch destination.
; Restores the AX register.
; Stores the memory bank number at the branch destination in RAM.
; Stores the address at the branch destination in RAM.
PD78F0889, 78F0890 ONLY)