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TIMER A
5.4 Event counter mode
Table 5.4.2 Specifications of event counter mode (when using two-phase pulse signal processing
function with timers A2, A3, and A4)
Item
Count source
Count operation
Count start condition
Count stop condition
Interrupt request occurrence timing
TAj
, TAj
(j = 2 to 4) pin function
IN
OUT
Read from timer Aj register
Write to timer Aj register
5–20
External signal (two-phase pulse) input to the TAj
2 to 4)
Up-count or down-count can be switched by external signal (two-
phase pulse).
When the counter overflows or underflows, reload register's contents
are reloaded and counting is continued.
When count start bit is set to "1."
When count start bit is cleared to "0."
When the counter overflows or underflows.
Two-phase pulse input
Counter value can be read out.
While counting is stopped
When a value is written to timer A2, A3, or A4 register, it is written
to both reload register and counter.
While counting is in progress
When a value is written to timer A2, A3, or A4 register, it is written
to only reload register. (Transferred to counter at next reload time.)
7751 Group User's Manual
Specifications
or TAj
pin (j =
IN
OUT
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