4502 Datasheet, PDF (63/116 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4502 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
BM a (Branch and Mark to address a in page 2)
Instruction
code
D9
D0
Number of Number of Flag CY
0
1
0
a6 a5 a4 a3 a2 a1 a0 1
2
a
a
16
words
1
cycles
1
–
Skip condition
–
Operation:
(SP) ← (SP) + 1
(SK(SP)) ← (PC)
(PCH) ← 2
(PCL) ← a6–a0
Grouping: Subroutine call operation
Description: Call the subroutine in page 2 : Calls the
subroutine at address a in page 2.
Note:
Subroutine extending from page 2 to an-
other page can also be called with the BM
instruction when it starts on page 2.
Be careful not to over the stack because the
maximum level of subroutine nesting is 8.
BML p, a (Branch and Mark Long to address a in page p)
Instruction
code
D9
D0
Number of Number of Flag CY
0
0
1
1
0
p4 p3 p2 p1 p0
2
0
C
+p
p
16
words
2
cycles
2
–
Skip condition
–
1 0 0 a6 a5 a4 a3 a2 a1 a0 ₂ 2 a a _{16 Grouping: Subroutine call operation}
Operation:
(SP) ← (SP) + 1
(SK(SP)) ← (PC)
(PCH) ← p
(PCL) ← a6–a0
Description: Call the subroutine : Calls the subroutine at
address a in page p.
Note:
p is 0 to 15 for M34502M2, and p is 0 to 31
for M34502M4/E4.
Be careful not to over the stack because the
maximum level of subroutine nesting is 8.
BMLA p (Branch and Mark Long to address (D) + (A) in page p)
Instruction
code
D9
D0
Number of Number of Flag CY
0000110000
030
words
cycles
2
16
2
2
–
Skip condition
–
Operation:
1 0 0 p4 0 0 p3 p2 p1 p0 ₂ 2 p p _{16 Grouping: Subroutine call operation}
(SP) ← (SP) + 1
(SK(SP)) ← (PC)
(PCH) ← p
(PCL) ← (DR2–DR0, A3–A0)
Description: Call the subroutine : Calls the subroutine at
address (DR2 DR1 DR0 A3 A2 A1 A0)2 speci-
fied by registers D and A in page p.
Note:
p is 0 to 15 for M34502M2, and p is 0 to 31
for M34502M4/E4.
Be careful not to over the stack because the
maximum level of subroutine nesting is 8.
CLD (CLear port D)
Instruction
code
D9
D0
Number of Number of Flag CY
0000010001
011
words
cycles
2
16
1
1
–
Skip condition
–
Operation: (D) ← 1
Grouping: Input/Output operation
Description: Sets (1) to port D.
Rev.3.01 2005.02.02 page 63 of 112
REJ03B0105-0301