參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 21/120頁
文件大小: 692K
代理商: HD4074459
HD404459 Series
21
Interrupt Enable Flag (IE: $000, Bit 0):
Controls the entire interrupt process. It is reset by the interrupt
processing and set by the RTNI instruction. Refer to table 4.
Table 4
Interrupt Enable Flag (IE: $000, Bit 0)
IE
Interrupt Enabled/Disabled
0
Disabled
1
Enabled
External Interrupts (
INT
0
,
INT
1
, INT
2
, INT
3
,
WU
0
WU
7
):
Five external interrupt signals.
External Interrupt Request Flags (IF0, IF1, IF2, IF3, IFWU: $000, $001, $003, $022):
IF0, IF1, and
IFWU are set at the falling edge of input signals, and IF2 and IF3 are set at the rising or falling edge or both
rising and falling edges of input signals (table 5). INT
2
and INT
3
interrupt edges are selected by the
detection edge select register (ESR1: $026) (figure 11).
Table 5
External Interrupt Request Flags (IF0–IF3, IFWU: $000, $001, $003, $022)
IF0–IF3, IFWU
Interrupt Request
0
No
1
Yes
Bit
Initial value
Read/Write
Bit name
3
0
W
ESR13
2
0
W
ESR12
0
0
W
ESR10
1
0
W
ESR11
Detection edge selection register 1 (ESR1: $026)
ESR11
0
1
ESR10
0
1
0
1
INT
2
detection edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
*
ESR13
0
1
ESR12
0
1
0
1
INT
3
detection edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
*
Note:
*
Both falling and rising edges are detected.
Figure 11 Detection Edge Selection Register 1 (ESR1)
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