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| 型号： | M38207M8-XXXHP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.50 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 37/69页 |
| 文件大小： | 944K |
| 代理商： | M38207M8-XXXHP |
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Rev.4.01
Nov 14, 2003
page 42 of 136
3803/3804 Group
q16-bit Timers
The timer Z is a 16-bit timer. When the timer reaches “000016”, an
underflow occurs at the next count pulse and the corresponding
timer latch is reloaded into the timer and the count is continued.
When the timer underflows, the interrupt request bit corresponding
to the timer Z is set to “1”.
When reading/writing to the timer Z, perform reading/writing to
both the high-order byte and the low-order byte. When reading the
timer Z, read from the high-order byte first, followed by the low-or-
der byte. Do not perform the writing to the timer Z between read
operation of the high-order byte and read operation of the low-or-
der byte. When writing to the timer Z, write to the low-order byte
first, followed by the high-order byte. Do not perform the reading
to the timer Z between write operation of the low-order byte and
write operation of the high-order byte.
The timer Z can select the count source by the timer Z count
source selection bits of timer Y, Z count source selection register
(bits 7 to 4 at address 000F16).
Timer Z can select one of seven operating modes by setting the
timer Z mode register (address 002A16).
(1) Timer mode
qMode selection
This mode can be selected by setting “000” to the timer Z operat-
ing mode bits (bits 2 to 0) and setting “0” to the timer/event
counter mode switch bit (b7) of the timer Z mode register (address
002A16).
qCount source selection
In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/
128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be selected as
the count source.
In low-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/
512 or 1/1024 of f(XCIN); or f(XCIN) can be selected as the count
source.
qInterrupt
When an underflow occurs, the INT0/timer Z interrupt request bit
(bit 0) of the interrupt request register 1 (address 003C16) is set to
“1”.
qExplanation of operation
During timer stop, usually write data to a latch and a timer at the
same time to set the timer value.
The timer count operation is started by setting “0” to the timer Z
count stop bit (bit 6) of the timer Z mode register (address
002A16).
When the timer reaches “000016”, an underflow occurs at the next
count pulse and the contents of timer latch are reloaded into the
timer and the count is continued.
When writing data to the timer during operation, the data is written
only into the latch. Then the new latch value is reloaded into the
timer at the next underflow.
(2) Event counter mode
qMode selection
This mode can be selected by setting “000” to the timer Z operat-
ing mode bits (bits 2 to 0) and setting “1” to the timer/event
counter mode switch bit (bit 7) of the timer Z mode register (ad-
dress 002A16).
The valid edge for the count operation depends on the CNTR2 ac-
tive edge switch bit (bit 5) of the timer Z mode register (address
002A16). When it is “0”, the rising edge is valid. When it is “1”, the
falling edge is valid.
qInterrupt
The interrupt at an underflow is the same as the timer mode’s.
qExplanation of operation
The operation is the same as the timer mode’s.
Set the double-function port of CNTR2 pin and port P47 to input in
this mode.
Figure 34 shows the timing chart of the timer/event counter mode.
(3) Pulse output mode
qMode selection
This mode can be selected by setting “001” to the timer Z operat-
ing mode bits (bits 2 to 0) and setting “0” to the timer/event
counter mode switch bit (b7) of the timer Z mode register (address
002A16).
qCount source selection
In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/
128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be selected as
the count source.
In low-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/
512 or 1/1024 of f(XCIN); or f(XCIN) can be selected as the count
source.
qInterrupt
The interrupt at an underflow is the same as the timer mode’s.
qExplanation of operation
The operation is the same as the timer mode’s. Moreover the
pulse which is inverted each time the timer underflows is output
from CNTR2 pin. When the CNTR2 active edge switch bit (bit 5) of
the timer Z mode register (address 002A16) is “0”, the output starts
with “H” level. When it is “1”, the output starts with “L” level.
sPrecautions
Set the double-function port of CNTR2 pin and port P47 to output
in this mode.
[During timer operation stop]
The output from CNTR2 pin is initialized to the level depending on
CNTR2 active edge switch bit by writing to the timer.
[During timer operation enabled]
When the value of the CNTR2 active edge switch bit is changed,
the output level of CNTR2 pin is inverted.
Figure 35 shows the timing chart of the pulse output mode.
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