參數(shù)資料
型號: HD404326
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系列微電腦(4位單片微計算機)
文件頁數(shù): 22/94頁
文件大小: 573K
代理商: HD404326
HD404328 Series
22
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, as shown in table 4.
Table 4
Interrupt Enable Flag
IE
Interrupt Enabled/Disabled
0
Disabled
1
Enabled
External Interrupts (
INT
0
, INT
1
):
Specified by port mode register A (PMRA: $004).
External Interrupt Request Flags (IF0: $000, Bit 2; IF1: $001, Bit 0):
Set at the rising or falling
edges of the
INT
0
and INT
1
inputs, as shown in table 5.
Table 5
External Interrupt Request Flags
IF0, IF1
Interrupt Request
0
No
1
Yes
IF0 is set at the falling edge of signals input to
INT
0
, and IF1 is set at the rising and falling edges of signals
input to INT
1
. The INT
1
interrupt edge is selected by the interrupt mode register (IMR: $010), as shown in
figure 9.
Interrupt mode register (IMR): $010
3
2
1
0
INT detection edge selection
ZCD detection edge selection
IMR
Bit 3
Bit 2
0
1
0
1
0
1
ZCD Detection Edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
IMR
Bit 1
Bit 0
0
1
0
1
0
1
INT Detection Edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
Initial value: 0000, R/W: W
Figure 9 Interrupt Mode Register
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