參數(shù)資料
型號: UPD78322L
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16/8-BIT單片機(jī)
文件頁數(shù): 46/88頁
文件大?。?/td> 479K
代理商: UPD78322L
46
μ
PD78320, 78322
4.3.2
Context Switching Function by BRKCS Instruction
The context switching function can be started by executing BRKCS instruction.
The context switched register bank is specified by the lower 3-bit immediate data of the 2nd operation code of BRKCS
instruction. When BRKCS instruction is executed, the register bank specified by the 3-bit immediate data is selected, the
vector address prestored in the register bank is set and branched to the PC, and the PC and PSW contents are saved into
the register bank.
Return is by means of executing the RETCSB instruction.
Figure 4-4. Context Switching by Execution of BRKCS Instruction
OP CODE
OP CODE
N
2
N
1
N
0
000
111
RBANK0
RBANK7
Register Bank Specification
(BRKCS)
Register
Banks
(0 – 7)
RBANK n (n = 0 – 7)
PC
PSW
Exchange
Save
A
B
R5
R7
D
H
X
C
R4
R6
E
L
VP
UP
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