CD00001237 Datasheet, PDF (60/105 Pages) STMicroelectronics – 8-bit MCUs with A/D converter

ST6215C ST6225C
INSTRUCTION SET (Cont’d)
Conditional Branch. Branch instructions perform
a branch in the program when the selected condi-
tion is met.
Control Instructions. Control instructions control
microcontroller operations during program execu-
tion.
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 subroutine calls
to any location in the whole program space.
Table 18. Conditional Branch Instructions
Instruction
Branch If
Bytes
Cycles
Flags
Z
C
JRC e
C=1
1
2
*
*
JRNC e
C=0
1
2
*
*
JRZ e
Z=1
1
2
*
*
JRNZ e
Z=0
1
2
*
*
JRR b, rr, ee
Bit = 0
3
5
*
Δ
JRS b, rr, ee
Bit = 1
3
5
*
Δ
Notes:
b 3-bit address
e 5 bit signed displacement in the range -15 to +16
ee 8 bit signed displacement in the range -126 to +129
rr Data space register
Δ Affected. The tested bit is shifted into carry.
* Not Affected
Table 19. 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
* Not Affected
rr Data space register
Bit Manipulation Instructions should not be used on Port Data Registers and any registers with read only and/or write only bits (see I/O port
chapter)
Table 20. 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
*
*
*
*
Δ
Δ
*
*
*
*
Notes:
1. This instruction is deactivated and a WAIT is automatically executed instead of a STOP if the watchdog function is selected.
Δ Affected
*Not Affected
Table 21. 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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