m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 122
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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Count source
Count operation
Division ratio
Count start condition
Count stop condition
Interrupt request occurrence timing
Function of the following pins:
TAj
Read from timer Aj register
Write to timer Aj register
Table 7.4.2 Specifications of event counter mode (when using two-phase pulse signal processing
IN
, TAj
OUT
function in timers A2 to A4, A7 to A9)
(j = 2 to 4, 7 to 9)
Item
External signal (two-phase pulse) input to the following pins:
TAj
When the count start bit is set to “1.”
When the count start bit is cleared to “0.”
When a counter overflow or underflow occurs.
Two-phase pulse input
Counter value can be read out by reading timer Aj register.
7905 Group User’s Manual Rev.1.0
When a counter overflow or underflow occurs, reload register’s con-
tents are reloaded, and counting continues.
When a value is written to timer Aj register, it is written to both of
the reload register and counter.
While counting is in progress
When a value is written to timer Aj register, it is written only to the reload
register. (Transferred to the counter at the next reload timing.)
Countup or countdown can be switched by external signal (two-
For countdown
For countup
While counting is stopped
phase pulse).
IN
, TAj
OUT
(j = 2 to 4, 7 to 9)
(FFFF
(n + 1)
16
1
1
– n + 1)
Specifications
n: Timer Aj register’s set value
7.4 Event counter mode
TIMER A
7-19
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