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S3C84E5/C84E9/P84E9 INSTRUCTION SET
6-53
LDC/LDE — Load Memory
LDC/LDE (Continued)
Examples: Given: R0 = 11H, R1 = 34H, R2 = 01H, R3 = 04H; Program memory locations
0103H = 4FH, 0104H = 1A, 0105H = 6DH, and 1104H = 88H.
External data memory locations
0103H = 5FH, 0104H = 2AH, 0105H = 7DH, and 1104H = 98H:
LDC R0,@RR2 ; R0 ← contents of program memory location 0104H;
; R0 = 1AH, R2 = 01H, R3 = 04H
LDE R0,@RR2 ; R0 ← contents of external data memory location
0104H;
; R0 = 2AH, R2 = 01H, R3 = 04H
LDC @RR2,R0 ; 11H (contents of R0) is loaded into program memory
; location 0104H (RR2); R0, R2, R3 → no change
LDE @RR2,R0 ; 11H (contents of R0) is loaded into external data
memory
; location 0104H (RR2); R0, R2, R3 → no change
LDC R0,#01H[RR2] ; R0 ← contents of program memory location 0105H
; (01H + RR2); R0 = 6DH, R2 = 01H, R3 = 04H
LDE R0,#01H[RR2] ; R0 ← contents of external data memory location
0105H
; (01H + RR2); R0 = 7DH, R2 = 01H, R3 = 04H
LDC #01H[RR2],R0 ; 11H (contents of R0) is loaded into program memory
location
; 0105H (01H + 0104H)
LDE #01H[RR2],R0 ; 11H (contents of R0) is loaded into external data
memory
; location 0105H (01H + 0104H)
LDC R0,#1000H[RR2] ; R0 ← contents of program memory location 1104H
; (1000H + 0104H); R0 = 88H, R2 = 01H, R3 = 04H
LDE R0,#1000H[RR2] ; R0 ← contents of external data memory location
1104H
; (1000H + 0104H); R0 = 98H, R2 = 01H, R3 = 04H
LDC R0,1104H ; R0 ← contents of program memory location 1104H
; R0 = 88H
LDE R0,1104H ; R0 ← contents of external data memory location
1104H;
; R0 = 98H
LDC 1105H,R0 ; 11H (contents of R0) is loaded into program memory
location
; 1105H; (1105H) ← 11H
LDE 1105H,R0 ; 11H (contents of R0) is loaded into external data
memory
; location 1105H; (1105H) ← 11H
NOTE: The LDC and the LDE instructions are not supported by masked ROM type devices.