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139
2. APPLICAT ION
3819 Group USER’S MANUAL
MITSUBISHI MICROCOMPUTER
3819 Group
2.6
Interrupt interval determination function
2.6 Interrupt interval determination function
2.6.1 Related registers
Fig. 2.6.2 Structure of Interrupt interval determination control register
Fig. 2.6.1 Structure of Interrupt interval determination register
Interrupt interval determination register
b7 b6 b5 b4 b3 b2 b1 b0
Function
At reset
R W
Interrupt interval determination register (IID) [Address:30
16
]
B
This register stores the values obtaind by counting the
following interval with a counter sampling clock.
Falling edge interval
Rising edge interval
Both-sided edge interval
(selected by the interrupt edge selection register)
This register is read-only.
G
G
G
Note :
When the noise filter sampling clock selection bits (bits 2 and 3) of the
Interrupt interval determination control register (IIDCON) (Address: 31
16
) is
set to “00” (when no noise filter is used), the both-sided edge detection
function is not available.
0
1
2
3
4
5
6
7
Interrupt interval determination control register
b7 b6 b5 b4 b3 b2 b1 b0
B
0
Function
At reset
R W
0
1
2
3
4
0
0
0
0
Interrupt interval determination control register (IIDCON) [Address:31
16
]
Name
Interrupt interval determination
circuit operating selection bit
Counter sampling clock
selection bit
Noise filter sampling clock
selection bits (INT
2
)
One-sided/both-sided edge
detection selection bit
Nothing is allocated for these bits. These are write disabled bits.
When these bits are read out, the values are "0."
0 : Stopped
1 : Operating
0 : f(X
IN
)/256
1 : f(X
IN
)/512
00 : Filter stop
01 : f(X
IN
)/64
10 : f(X
IN
)/128
11 : f(X
IN
)/256
0 : One-sided edge detection
1 : Both-sided edge detection (Note)
6
7
Note :
When the noise filter sampling clock selection bits (bits 2 and 3) of the
Interrupt interval determination control register (IIDCON) (Address: 31
16
) is
set to “00” (when no noise filter is used), the both-sided edge detection
function is not available.
5
0
0
0