參數(shù)資料
型號: HD404639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 22/133頁
文件大小: 803K
代理商: HD404639R
HD404639R Series
22
Bit
Initial value
Read/Write
Bit name
3
0
W
ESR23
2
0
W
ESR22
0
0
W
1
0
W
ESR21
Detection edge selection register 2 (ESR2: $027)
ESR23
0
1
ESR22
0
1
0
1
EVND detection edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
Note: Both falling and rising edges are detected.
ESR20
*
ESR21
0
1
ESR20
0
1
0
1
INT detection edge
No detection
Falling-edge detection
Rising-edge detection
Double-edge detection
*
Figure 13 detection Edge Selection Register 2 (ESR2)
External Interrupt Masks (IM0–IM4: $000, $001, $022, $023):
Prevent (mask) interrupt requests
caused by the corresponding external interrupt request flags, as listed in table 6.
Table 6 External Interrupt Masks (IM0–IM4: $000, $001, $022, $023)
IM0–IM4
Interrupt Request
0
Enabled
1
Disabled (masked)
Timer A Interrupt Request Flag (IFTA: $001, Bit 2):
Set by overflow output from timer A, as listed in
table 7.
Table 7 Timer A Interrupt Request Flag (IFTA: $001, Bit 2)
IFTA
Interrupt Request
0
No
1
Yes
Timer A Interrupt Mask (IMTA: $001, Bit 3):
Prevents (masks) an interrupt request caused by the
timer A interrupt request flag, as listed in table 8.
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