TC1796
System Units (Vol. 1 of 2)
Peripheral Control Processor (PCP)
User’s Manual 11-83 V2.0, 2007-07
PCP, V2.0
11.11.8 CHKB, Check Bit
This section describes the CHKB instruction of the PCP.
11.11.9 CLR, Clear Bit
CHKB Syntax CHKB Ra, #imm5, S/C
Description If bit imm5 of register Ra is equal to the specified test value
S/C then set the carry flag R7.C, else clear the carry flag.
Operation if (R[a][imm5] = S/C) then R7_C = 1 else R7_C = 0
Flags C
CLR Syntax CLR Ra, #imm5
Description Clear bit imm5 of register Ra to 0.
Operation R[a][imm5] = 0
Flags None
CLR.F Syntax CLR.F [Ra], #imm5, Size
Description Clear bit imm5 of the address location specified through the
contents of register Ra to 0. This instruction is executed
using a locked read-modify-write FPI Bus transaction.
Operation FPI[(R[a])][imm5] = 0
Flags None
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