參數(shù)資料
型號: NSC800
廠商: National Semiconductor Corporation
英文描述: NSC800TM High-Performance Low-Power CMOS Microprocessor
中文描述: NSC800TM高性能低功耗CMOS微處理器
文件頁數(shù): 57/76頁
文件大小: 785K
代理商: NSC800
12.14 Program Control
(Continued)
RETN
Unconditional return from non-maskable interrupt handling
subroutine. Functionally similar to RET instruction, except
interrupt enable state is restored to that prior to non-mask-
able interrupt.
PC
L
w
(SP)
No flags affected
PC
H
w
(SP
a
1)
SP
w
SP
a
2
IFF
1
w
IFF
2
7
6
5
4
3
2
1
0
1
1
1
0
1
1
0
1
0
1
0
0
0
1
0
1
Timing:
M cycles D 4
T states D 14 (4, 4, 3, 3)
Addressing Mode:
Register Indirect
RESTARTS
RST
P
The present contents of the PC are pushed onto the memo-
ry stack and the PC is loaded with dedicated program loca-
tions as determined by the specific restart executed.
(SP
b
1)
w
PC
H
No flags affected
(SP
b
2)
w
PC
L
SP
w
SP
b
2
PC
H
w
0
PC
L
w
P
7
6
5
4
3
2
1
0
1
1
t
1
1
1
Timing:
M cycles D 3
T states D 11 (5, 3, 3)
Addressing Mode:
Modified Page Zero
p
00H
08H
10H
18H
20H
28H
30H
38H
t
000
001
010
011
100
101
110
111
57
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