ST6246 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST6246

8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

STMicroelectronics 

ST62T46B/E46B

INSTRUCTION SET (Cont’d)

Conditional Branch. The branch instructions

achieve a branch in the program when the select-

ed condition is met.

Control Instructions. The control instructions

control the MCU operations during program exe-

cution.

Bit Manipulation Instructions. These instruc-

tions 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.

Jump and Call. These two instructions are used

to perform long (12-bit) jumps or subroutines call

inside the whole program space.

Table 24. Conditional Branch Instructions

Instruction

Branch If

Bytes

JRC e

C=1

1

JRNC e

C=0

1

JRZ e

Z=1

1

JRNZ e

Z=0

1

JRR b, rr, ee

Bit = 0

3

JRS b, rr, ee

Bit = 1

3

Notes:

b. 3-bit address

e. 5 bit signed displacement in the range -15 to +16<F128M>

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

Cycles

2

2

2

2

5

5

Flags

Z

C

*

*

*

*

*

*

*

*

*

∆

*

∆

rr. Data space register

∆ . Affected. The tested bit is shifted into carry.

* . Not Affected

Table 25. Bit Manipulation Instructions

Instruction

SET b,rr

RES b,rr

Addressing Mode

Bit Direct

Bit Direct

Bytes

2

2

Cycles

4

4

Flags

Z

C

*

*

*

*

Notes:

b. 3-bit address;

rr. Data space register;

* . Not<M> Affected

Table 26. Control Instructions

Instruction

NOP

RET

RETI

STOP (1)

WAIT

Addressing Mode

Inherent

Inherent

Inherent

Inherent

Inherent

Bytes

1

1

1

1

1

Cycles

2

2

2

2

2

Flags

Z

C

*

*

*

*

∆

∆

*

*

*

*

Notes:

1. This instruction is deactivated<N>and a WAI T is automatically executed instead of a STOP if the watchdog function is selected.

∆ . Affected

*. Not Affected

Table 27. Jump & Call Instructions

Instruction

CALL abc

JP abc

Addressing Mode

Extended

Extended

Bytes

2

2

Cycles

4

4

Flags

Z

C

*

*

*

*

Notes:

abc. 12-bit address;

* . Not Affected

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