參數(shù)資料
型號(hào): PD784054GCA2
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機(jī)
文件頁(yè)數(shù): 40/86頁(yè)
文件大小: 579K
代理商: PD784054GCA2
μ
PD784054(A)
40
8.3 Context Switching
A specific register bank is selected by hardware when an interrupt request is generated or when the BRKCS
instruction is executed.
Execution branches to the vector address stored in advance to the selected register bank, and the current
contents of the program counter (PC) and program status word (PSW) are stacked to the register bank.
The branch destination address must be in a range of 0 to FFFFH.
Figure 8-1. Context Switching Operation When Interrupt Request Is Generated
V
U
T
W
A
B
R5
R7
D
H
X
C
R4
R6
E
L
VP
UP
Register bank n (n = 0 to 7)
< 3 > Select register bank (RBS0 to RBS2
n)
< 4 > RSS
0
IE
0
< 6 > Exchange
< 5 > Save
< 7 > Transfer
< 1 > Save
0000B
< 2 > Save
(bits 8 through
11 of temporary
register)
Temporary register
PSW
PC19-16
PC15_0
Register bank
(0 to 7)
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