UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 86
![8BIT MCU, 128K FLASH, 7K RAM, LQFP](/photos/19/1/190186/ge64lqfp05-40_sml.jpg)
UPD78F0890GK(A)-GAJ-AX
Manufacturer Part Number
UPD78F0890GK(A)-GAJ-AX
Description
8BIT MCU, 128K FLASH, 7K RAM, LQFP
Manufacturer
NEC
Datasheet
1.UPD78F0890GKA-GAJ-AX.pdf
(732 pages)
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
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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)
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