Samsung KS57C2308 Manual page 105

KS57C2308/P2308/C2316/P2316
BITR
— Bit Reset
BITR dst.b
Operation: Operand
DA.b
mema.b
memb.@L
@H+DA.b
Description: A BITR instruction clears to logic zero (resets) the specified bit within the destination operand. No
other bits in the destination are affected.
Operand
DA.b
mema.b
memb.@L
@H+DA.b
*
mema.b
Examples: 1. If the bit location 30H.2 in the RAM has a current value of "1". The following instruction
clears the third bit of location 30H to "0":
BITR
2. You can use BITR in the same way to manipulate a port address bit:
BITR
Clear specified memory bit to logic zero
Binary Code
1 1 b1
a7 a6 a5
1 1 1
*
1 1 1
0 1 0
1 1 1
0 0 b1
Second Byte
1 0 b1
1 1 b1
30H.2
P2.0
Operation Summary
b0 0 0 0
a4 a3 a2 a1 a0
1 1 1 1
1 1 1 1
0 a5 a4 a3 a2
1 1 1 1
b0 a3 a2 a1 a0
b0 a3 a2 a1 a0 FB0H–FBFH
b0 a3 a2 a1 a0 FF1H–FF9H
; 30H.2 "0"
; P2.0 "0"
SAM47 INSTRUCTION SET
Bytes
2
2
2
2
Operation Notation
0
DA.b 0
0
mema.b 0
0 [memb.7–2 + L3–2].[L.1–0]
0 [H + DA.3–0].b
Bit Addresses
Cycles
2
2
2
2
0
0
5-31