UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 84

• 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

84
• Software example (to store a value to be referenced in register A)
RAMD
R_BNKA:
R_BNKN:
R_BNKRN: DS
ETRC
ENTRY:
BNKC
BNKRD:
DATA
DATA1:
END
CSEG
DSEG
DS
DS
MOV
MOVW
CALL
CSEG
PUSH
MOV
XCH
MOV
XCHW
MOVW
XCHW
MOV
XCH
MOV
MOV
POP
RET
CSEG
DB
CHAPTER 4 MEMORY BANK SELECT FUNCTION (
SADDR
2
1
1
UNIT
R_BNKN,#BANKNUM DATA1
R_BNKA,#DATA1
!BNKRD
AT
HL
A,R_BNKN
A,BANK
R_BNKRN,A
AX,HL
AX,R_BNKA
AX,HL
A,[HL]
A,R_BNKRN
BANK,A
A,R_BNKRN
HL
BANK3
0AAH
:
:
7000H
User’s Manual U17554EJ4V0UD
; Secures RAM for specifying an address at the reference destination.
; Secures RAM for specifying a memory bank number at the reference destination.
; Secures RAM for saving a memory bank number at the reference source.
; Stores the memory bank number at the reference destination.
; Stores the address at the reference destination.
; Swaps the memory bank number at the reference source for that at the reference
; destination
; Reads the target value.
; Specifies the memory bank number at the reference source.
; Restores the contents of the HL register.
; Return
; Calls a subroutine for referencing between memory banks.
; Subroutine for referencing between memory banks.
; Saves the contents of the HL register.
; Acquires the memory bank number at the reference destination.
; Saves the memory bank number at the reference source.
; Saves the contents of the X register.
; Acquires the address at the reference destination.
; Specifies the address at the reference destination.
; Acquires the memory bank number at the reference source.
; Write the target value to the A register.
PD78F0889, 78F0890 ONLY)