KS57C2308/P2308/C2316/P2316
SAM47 INSTRUCTION SET
5-37
BTSF
— Bit Test and Skip on False
BTSF
dst.b
Operation:
Operand
Operation Summary
Bytes
Cycles
DA.b
Test specified memory bit and skip if bit equals "0"
2
2 + S
mema.b
2
2 + S
memb.@L
2
2 + S
@H+DA.b
2
2 + S
Description:
The specified bit within the destination operand is tested. If it is a "0", the BTSF instruction skips
the instruction which immediately follows it; otherwise the instruction following the BTSF is
executed. The destination bit value is not affected.
Operand
Binary Code
Operation Notation
DA.b
1
1
b1
b0
0
0
1
0
Skip if DA.b = 0
a7
a6
a5
a4
a3
a2
a1
a0
mema.b
*
1
1
1
1
1
0
0
0
Skip if mema.b = 0
memb.@L
1
1
1
1
1
0
0
0
Skip if [memb.7–2 + L.3-2].
[L.1–0] = 0
0
1
0
0
a5
a4
a3
a2
@H + DA.b
1
1
1
1
1
0
0
0
Skip if [H + DA.3–0].b = 0
0
0
b1
b0
a3
a2
a1
a0
Second Byte
Bit Addresses
*
mema.b
1
0
b1
b0
a3
a2
a1
a0
FB0H–FBFH
1
1
b1
b0
a3
a2
a1
a0
FF0H–FFFH
Examples:
1. If RAM bit location 30H.2 is set to “0”, the following instruction sequence will cause the
program to continue execution from the instruction identified as LABEL2:
BTSF
30H.2
; If 30H.2 = "0", then skip
RET
; If 30H.2 = "1", return
JP
LABEL2
2. You can use BTSF in the same way to test a port pin address bit:
BTSF
P2.0
; If P2.0 = "0", then skip
RET
; If P2.0 = "1", then return
JP
LABEL3
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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