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| 型號： | M37560EFDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 26/92頁 |
| 文件大小： | 1507K |
| 代理商： | M37560EFDFP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
29
Timer X
Timer X is a 16-bit timer and is equipped with the timer latch. The
division ratio of timer X is given by 1/(n+1), where n is the value in
the timer latch. Timer X is a down-counter. When the contents of
timer X reach “000016”, an underflow occurs at the next count
pulse and the contents of the timer latch are reloaded into the
timer and the count is continued. When the timer underflows, the
timer X interrupt request bit is set to “1”.
Timer X can be selected in one of four modes by the timer X mode
register and can be controlled the timer X write and the real time
port.
(1) Timer mode
The timer counts f(XIN)/16 (or f(XCIN)/16 in low-speed mode).
(2) Pulse output mode
Each time the timer underflows, a signal output from the CNTR0
pin is inverted. Except for this, the operation in pulse output mode
is the same as in timer mode. When using a timer in this mode,
set the P54/CNTR0 pin to output mode (set “1” to bit 4 of port P5
direction register).
(3) Event counter mode
The timer counts signals input through the CNTR0 pin.
Except for this, the operation in event counter mode is the same
as in timer mode. When using a timer in this mode, set the P54/
CNTR0 pin to input mode (set “0” to bit 4 of port P5 direction reg-
ister).
(4) Pulse width measurement mode
The count source is f(XIN)/16 (or f(XCIN)/16 in low-speed mode). If
CNTR0 active edge switch bit is “0”, the timer counts while the
input signal of CNTR0 pin is at “H”. If it is “1”, the timer counts
while the input signal of CNTR0 pin is at “L”. When using a timer in
this mode, set the P54/CNTR0 pin to input mode (set “0” to bit 4 of
port P5 direction register).
qRead and write to timer X high-order, low-order registers
When reading and writing to the timer X high-order and low-order
registers, be sure to read/write both the timer X high- and low-or-
der registers.
When reading the timer X high-order and low-order registers, read
the high-order register first. When writing to the timer X high-order
and low-order registers, write the low-order register first. The timer
X cannot perform the correct operation if the next operation is per-
formed.
Write operation to the high- or low-order register before reading
the timer X low-order register
Read operation from the high- or low-order register before writing
to the timer X high-order register
Fig. 25 Structure of timer X mode register
Timer X mode register
(TXM : address 002716)
Timer X write control bit
0 : Write value in latch and timer
1 : Write value in latch only
Real time port control bit
0 : Real time port function invalid
1 : Real time port function valid
RTP0 data for real time port
RTP1 data for real time port
Timer X operating mode bits
b5 b4
0
0 : Timer mode
0
1 : Pulse output mode
1
0 : Event counter mode
1
1 : Pulse width measurement mode
CNTR0 active edge switch bit
0 : Count at rising edge in event counter mode
Start from “H” output in pulse output mode
Measure “H” pulse width in pulse width measurement
mode
Falling edge active for CNTR0 interrupt
1 : Count at falling edge in event counter mode
Start from “L” output in pulse output mode
Measure “L” pulse width in pulse width measurement
mode
Rising edge active for CNTR0 interrupt
Timer X stop control bit
0 : Count start
1 : Count stop
b7
b0
qTimer X Write Control
Which write control can be selected by the timer X write control bit
(bit 0) of the timer X mode register (address 002716), writing data
to both the latch and the timer at the same time or writing data
only to the latch. When the operation “writing data only to the
latch” is selected, the value is set to the timer latch by writing data
to the timer X register and the timer is updated at next underflow.
After reset, the operation “writing data to both the latch and the
timer at the same time” is selected, and the value is set to both
the latch and the timer at the same time by writing data to the
timer X register. The write operation is independent of timer X
count operation, operating or stopping.
When the value is written in latch only, a value is simultaneously
set to the timer X and the timer X latch if the writing in the high-
order register and the underflow of timer X are performed at the
same timing. Unexpected value may be set in the high-order timer
on this occasion.
qReal Time Port Control
While the real time port function is valid, data for the real time port
are output from ports P52 and P53 each time the timer X
underflows. (However, if the real time port control bit is changed
from “0” to “1” after set of the real time port data, data are output
independent of the timer X operation.) If the data for the real time
port is changed while the real time port function is valid, the
changed data are output at the next underflow of timer X.
Before using this function, set the P52/RTP0, P53/RTP1 pins to
output mode (set “1” to bits 2, 3 of port P5 direction register).
sNote on CNTR0 interrupt active edge selection
CNTR0 interrupt active edge depends on the CNTR0 active edge
switch bit.
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