m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 114
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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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the timer mode. Figure 7.3.1 shows the structures of the timer Ai register and timer Ai mode register in the
timer mode.
Count source f
Count operation
Count start condition
Count stop condition
Interrupt request occurrence timing
TAi
TAi
Read from timer Ai register
Write to timer Ai register
7.3 Timer mode
In this mode, the timer counts an internally generated count source. Table 7.3.1 lists the specifications of
Table 7.3.1 Specifications of timer mode
Division ratio
IN
OUT
pin function
pin function
i
Item
f
• Countdown
• When a counter underflow occurs, reload register’s contents are
When count start bit is set to “1.”
When count start bit is cleared to “0.”
When a counter underflow occurs.
Programmable I/O port pin or gate input pin
Programmable I/O port pin or pulse output pin
Counter value can be read out.
1
, f
reloaded, and counting continues.
7905 Group User’s Manual Rev.1.0
While counting is stopped
When a value is written to the timer Ai register, it is written to both
reload register and counter.
While counting is in progress
When a value is written to the timer Ai register, it is written to only
reload register. (Transferred to the counter at the next reload timing.)
2
, f
(n + 1)
16
, f
1
64
, f
512
, or f
n : Timer Ai register setting value
4096
Specifications
7.3 Timer mode
TIMER A
7-11
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