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User’s Manual U11969EJ3V0UM00
CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
5.3.9 Frequency divider
The V854 can internally divide the frequency of the signals input to P11 to P13 (INTP11 to INTP13) pins. The
divided result becomes external interrupt request signal or timer capture trigger.
Frequency division ratio is set to event divide control register (EDVC) and comparing it with the value in event divide
counter (EDV), and if they coincide, the value becomes the internal event signal, so that the frequency of the INTP
signal is divided. 1 to 64 frequency division is possible for INTP11 and INTP12 signal. If INTP12 signal is divided
1 to 64 , it can be further divided 1 to 128. However, INTP13 signal cannot be used when this function is used.
The block diagram of the INTP11 to INTP13 input is shown below.
The block diagram of the frequency divider is shown below.
Remark
n = 0 to 2
(1) Event divide counter 0 to 2 (EDV0 to EDV2)
This register counts the valid edge of the INTPn input signal (n = 11 to 13). The EDV0 and EDV1 registers
are configured with a 6-bit counter, and EDV2 register is configured with a 7-bit counter.
These registers are cleared at the following timings:
• Coincidence of the value in the event divide control register (EDVCn) and the count value
• Write to EDVCn register
Remark
n = 0 to 2
These registers can be only read in 8/1-bit units. Edge inputs may not be counted when changing the
specification of the valid edge of the INTMn register (n = 1 to 6).
EDVn
Input valid edge
EDVCn
Internal event signal
Coincidence
Clear
INTP11
Noise elimination
Edge detection
INTCP11
1 to 64 frequency division
(EDV0, EDVC0)
RPU
INTP12
Noise elimination
Edge detection
INTCP12
1 to 64 frequency division
(EDV1, EDVC1)
RPU
INTP13
Noise elimination
Edge detection
INTCP13
Selector
ESE bit
1 to 128 frequency division
(EDV2, EDVC2)
RPU
Содержание V854 UPD703006
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