ST6391 datasheet(59/68 Pages) STMICROELECTRONICS

59 / 68 page

SOFTWARE DESCRIPTION (Continued)

Conditional Branch. The branch instructions

achieve a branch in the program when the selected

condition is met. See Table 18.

Bit Manipulation Instructions. These instructions

can handle any bit in data space memory. One

group either sets or clears. The other group (see

Conditional Branch) performs the bit test branch

operations. See Table 19.

Control Instructions. The control instructions

control the MCU operations during program execu-

tion. See Table 20.

Jump and Call. These two instructions are used to

perform long (12-bit) jumps or subroutines call

inside the whole program space. Refer to Table 21.

Instruction

Branch If

Bytes

Cycles

Flags

JRC e

C = 1

JRNC e

C = 0

JRZ e

Z = 1

JRNZ e

Z = 0

JRR b, rr, ee

Bit = 0

∆

JRS b, rr, ee

Bit = 1

∆

Notes:

3-bit address

rr.

Data space register

5 bit signed displacement in the range -15 to +16

∆

. Affected

ee. 8 bit signed displacement in the range -126 to +129

* .

Not Affected

Table 18. Conditional Branch Instructions

Instruction

Addressing

Mode

Bytes

Cycles

Flags

SET b,rr

Bit Direct

RES b,rr

Bit Direct

Notes:

3-bit address;

* . Not Affected

rr.

Data space register;

Table 19. Bit Manipulation Instructions

Instruction

Addressing

Mode

Bytes

Cycles

Flags

NOP

Inherent

RET

Inherent

RETI

Inherent

∆∆

STOP (1)

Inherent

WAIT

Inherent

Notes:

This instruction is deactivated and a WAITis automatically executed instead of a STOP if the hardware activated

watchdog function is selected.

∆ . Affected

* . Not Affected

Table 20. Control Instructions

Instruction

Addressing

Mode

Bytes

Cycles

Flags

CALL abc

Extended

JP abc

Extended

Notes:

abc.12-bit address;

* . Not Affected

Table 21. Jump & Call Instructions

ST6391,92,93,95,97,99

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