Datasheet

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Instruction Set Description

4.6.2.24 JC, JHS

JC Jump if carry

JHS Jump if higher or same (unsigned)

JC label

Syntax

JHS label

Operation If C = 1: PC + (2 × Offset) → PC

If C = 0: execute the following instruction

Description

The carry bit C in the SR is tested. If it is set, the signed 10-bit word offset contained in

the instruction is multiplied by two, sign extended, and added to the 20-bit PC. This

means a jump in the range –511 to +512 words relative to the PC in the full memory

range. If C is reset, the instruction after the jump is executed.

JC is used for the test of the carry bit C.

JHS is used for the comparison of unsigned numbers.

Status Bits Status bits are not affected

Mode Bits OSCOFF, CPUOFF, and GIE are not affected.

Example The state of the port 1 pin P1IN.1 bit defines the program flow.

BIT.B #2,&P1IN ; Port 1, bit 1 set? Bit -> C

JC Label1 ; Yes, proceed at Label1

... ; No, continue

Example If R5 ≥ R6 (unsigned), the program continues at Label2.

CMP R6,R 5 ; Is R5 >= R6? Info to C

JHS Label2 ; Yes, C = 1

... ; No, R5 < R6. Continue

Example If R5 ≥ 12345h (unsigned operands), the program continues at Label2.

CMPA #12345h,R5 ; Is R5 >= 12345h? Info to C

JHS Label2 ; Yes, 12344h < R5 <= F,FFFFh. C = 1

... ; No, R5 < 12345h. Continue

187

SLAU144J–December 2004–Revised July 2013 CPUX

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