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| 型號： | M37544 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 22/68頁 |
| 文件大?。?/td> | 579K |
| 代理商： | M37544 |
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7544 Group
Rev.1.04 2004.06.08 page 22 of 66
REJ03B0012-0104Z
Timers
The 7544 Group has 3 timers: timer 1, timer A and timer X.
The division ratio of every timer and prescaler is 1/(n+1) provided
that the value of the timer latch or prescaler is n.
All the timers are down count timers. When a timer reaches “0”, an
underflow occurs at the next count pulse, and the corresponding
timer latch is reloaded into the timer. When a timer underflows, the
interrupt request bit corresponding to each timer is set to “1”.
●
Timer 1
Timer 1 is an 8-bit timer and counts the prescaler output.
When Timer 1 underflows, the timer 1 interrupt request bit is set to
“1”.
Prescaler 1 is an 8-bit prescaler and counts the signal selected by
the timer 1 count source selection bit.
Prescaler 1 and Timer 1 have the prescaler 1 latch and the timer 1
latch to retain the reload value, respectively. The value of
prescaler 1 latch is set to Prescaler 1 when Prescaler 1
underflows. The value of timer 1 latch is set to Timer 1 when Timer
1 underflows.
When writing to Prescaler 1 (PRE1) is executed, the value is writ-
ten to both the prescaler 1 latch and Prescaler 1.
When writing to Timer 1 (T1) is executed, the value is written to
both the timer 1 latch and Timer 1.
When reading from Prescaler 1 (PRE1) and Timer 1 (T1) is ex-
ecuted, each count value is read out.
Timer 1 always operates in the timer mode.
Prescaler 1 counts the signal selected by the timer 1 count source
selection bit. Each time the count clock is input, the contents of
Prescaler 1 is decremented by 1. When the contents of Prescaler
1 reach “00
16
”, an underflow occurs at the next count clock, and
the prescaler 1 latch is reloaded into Prescaler 1 and count contin-
ues. The division ratio of Prescaler 1 is 1/(n+1) provided that the
value of Prescaler 1 is n.
The contents of Timer 1 is decremented by 1 each time the under-
flow signal of Prescaler 1 is input. When the contents of Timer 1
reach “00
16
”, an underflow occurs at the next count clock, and the
timer 1 latch is reloaded into Timer 1 and count continues. The di-
vision ratio of Timer 1 is 1/(m+1) provided that the value of Timer
1 is m. Accordingly, the division ratio of Prescaler 1 and Timer 1 is
1/((n+1)
(m+1)) provided that the value of Prescaler 1 is n and
the value of Timer 1 is m.
Timer 1 cannot stop counting by software.
●
Timer A
Timer A is a 16-bit timer and counts the signal selected by the
timer A count source selection bit. When Timer A underflows, the
timer A interrupt request bit is set to “1”.
Timer A consists of the low-order of Timer A (TAL) and the high-or-
der of Timer A (TAH).
Timer A has the timer A latch to retain the reload value. The value
of timer A latch is set to Timer A at the timing shown below.
When Timer A undeflows.
When an active edge is input from CNTR
1
pin (valid only when
period measurement mode and pulse width HL continuously mea-
surement mode).
When writing to both the low-order of Timer A (TAL) and the high-
order of Timer A (TAH) is executed, the value is written to both the
timer A latch and Timer A.
When reading from the low-order of Timer A (TAL) and the high-or-
der of Timer A (TAH) is executed, the following values are read out
according to the operating mode.
In timer mode, event counter mode:
The count value of Timer A is read out.
In period measurement mode, pulse width HL continuously mea-
surement mode:
The measured value is read out.
Be sure to write to/read out the low-order of Timer A (TAL) and the
high-order of Timer A (TAH) in the following order;
Read
Read the high-order of Timer A (TAH) first, and the low-order of
Timer A (TAL) next and be sure to read out both TAH and TAL.
Write
Write to the low-order of Timer A (TAL) first, and the high-order of
Timer A (TAH) next and be sure to write to both TAL and TAH.
Timer A can be selected in one of 4 operating modes by setting
the timer A mode register.
(1) Timer mode
Timer A counts the selected by the timer A count source selection
bit. Each time the count clock is input, the contents of Timer A is
decremented by 1. When the contents of Timer A reach “0000
16
”,
an underflow occurs at the next count clock, and the timer A latch
is reloaded into Timer A. The division ratio of Timer A is 1/(n+1)
provided that the value of Timer A is n.
(2) Period measurement mode
In the period measurement mode, the pulse period input from the
P0
0
/CNTR
1
pin is measured.
CNTR
1
interrupt request is generated at rising/falling edge of
CNTR
1
pin input signal. Simultaneously, the value in the timer A
latch is reloaded in Timer A and count continues. The active edge
of CNTR
1
pin input signal can be selected from rising or falling by
the CNTR
1
active edge switch bit .The count value when trigger
input from CNTR
1
pin is accepted is retained until Timer A is read
once.
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