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4571 Datasheet, PDF (72/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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4571 Group
MACHINE INSTRUCTIONS (INDEX BY ALPHABET) (continued)
B a (Branch to address a)
Instruc-
tion
code
D9
D0
0
1
1 a6 a5 a4 a3 a2 a1 a0 2
1
8
+a
a
16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
-
Opera- (PCL) ← a6 to a0
tion:
Grouping: Branch operation
Description: Branch within a page : Branches to address a in the identi-
cal page.
Note:
Specify the branch address within the page including this
instruction.
BL p,a (Branch Long to address a in page p)
Instruc-
tion
code
D9
D0
0
0
1
1
1 p4 p3 p2 p1 p0 2
0
E
+p
p
16
Number of
words
2
Number of
cycles
2
Flag CY
-
Skip condition
-
1 p6 p5 a6 a5 a4 a3 a2 a1 a0 2 2 a a 16 Grouping: Branch operation
Opera- (PCH) ← p
tion: (PCL) ← a6 to a0
Description: Branch out of a page : Branches to address a in page p.
Note:
M34571G4 : p = 0 to 31
M34571G6 : p = 0 to 47
M34571GD : p = 0 to 127
BLA p (Branch Long to address (D)+(A) in page p)
Instruc-
tion
code
D9
D0
0 0 0 0 0 1 0 0 0 0 2 0 1 0 16
Number of
words
2
Number of
cycles
2
Flag CY
-
Skip condition
-
1 p6 p5 p4 0 0 p3 p2 p1 p0 2 2 p p 16 Grouping: Branch operation
Opera- (PCH) ← p
tion: (PCL) ← (DR2−R0, A3−A0)
Description: Branch out of a page : Branches to address (DR2 DR1 DR0
A3 A2 A1 A0)2 specified by registers D and A in page p.
Note:
M34571G4 : p = 0 to 31
M34571G6 : p = 0 to 47
M34571GD : p = 0 to 127
BM a (Branch and Mark to address a in page 2)
Instruc-
tion
code
D9
D0
0 1 0 a6 a5 a4 a3 a2 a1 a0 2 1 a
a 16
Number of
words
1
Number of
cycles
1
Flag CY
-
Skip condition
-
Opera-
tion:
(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 another 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.
Rev.1.02 May 25, 2007 Page 72 of 124
REJ03B0179-0102
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