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3-23 M32R-FPU Software Manual (Rev.1.01)

BNCBNC

branch instruction

Branch on not C-bit

[Mnemonic]

(1) BNC pcdisp8

(2)

BNC pcdisp24

[Function]

Branch

(1) if (C==0) PC = ( PC & 0xfffffffc ) + ( ( ( signed char ) pcdisp8 ) << 2 );

(2) if (C==0) PC = ( PC & 0xfffffffc ) + ( sign_extend ( pcdisp24 ) << 2 );

where

#define sign_extend(x) ( ( ( signed ) ( (x)<< 8 ) ) >>8 )

[Description]

BNC branches to the specified label when the condition bit (C) is 0.

There are two instruction formats; this allows software, such as an assembler, to decide on the

better format.

The condition bit (C) is unchanged.

[EIT occurrence]

None

[Encoding]

11011111

11010111

BNC pcdisp24

BNC pcdisp8

pcdisp8

pcdisp24

INSTRUCTIONS

3.2 Instruction description

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 193 194

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