upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 513

• Manufacturer Part Number: upd78f0114m6gb-8es
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

16-bit
timer/
event
counter
00
(TM00)
Function
Pulse width
measurement
External event
counter
One-shot pulse
output:
Software trigger
One-shot pulse
output: External
trigger
Timer start
errors
16-bit timer
capture/compare
register setting
Capture register
data retention
timing
Valid edge
setting
One-shot pulse
output: Software
trigger
One-shot pulse
output: External
trigger
One-shot pulse
output function
Details of
Function
To use two capture registers, set the TI000 and TI010 pins.
When reading the external event counter count value, TM00 should be read.
Do not set the OSPT00 bit to 1 while the one-shot pulse is being output. To
output the one-shot pulse again, wait until the current one-shot pulse output is
completed.
When using the one-shot pulse output of 16-bit timer/event counter 00 with a
software trigger, do not change the level of the TI000 pin or its alternate-function
port pin.
Because the external trigger is valid even in this case, the timer is cleared and
started even at the level of the TI000 pin or its alternate-function port pin, resulting
in the output of a pulse at an undesired timing.
Do not set the CR000 and CR010 registers to 0000H.
16-bit timer counter 00 starts operating as soon as a value other than 00
(operation stop mode) is set to the TMC003 and TMC002 bits.
Even if the external trigger is generated again while the one-shot pulse is output,
it is ignored.
Do not set the CR000 and CR010 registers to 0000H.
16-bit timer counter 00 starts operating as soon as a value other than 00
(operation stop mode) is set to the TMC003 and TMC002 bits.
An error of up to one clock may occur in the time required for a match signal to be
generated after timer start. This is because 16-bit timer counter 00 (TM00) is
started asynchronously to the count clock.
In the mode in which clear & start occurs on a match between TM00 and CR000,
set 16-bit timer capture/compare registers 000 and 010 (CR000 and CR010) to
other than 0000H. This means a 1-pulse count operation cannot be performed
when 16-bit timer/event counter 00 is used as an external event counter.
The values of 16-bit timer capture/compare registers 000 and 010 (CR000 and
CR010) are not guaranteed after 16-bit timer/event counter 00 has been stopped.
Set the valid edge of the TI000 pin after setting bits 2 and 3 (TMC002 and
TMC003) of 16-bit timer mode control register 00 (TMC00) to 0, 0, respectively,
and then stopping timer operation. The valid edge is set using bits 4 and 5
(ES000 and ES001) of prescaler mode register 00 (PRM00).
When a one-shot pulse is output, do not set the OSPT00 bit to 1. Do not output
the one-shot pulse again until INTTM000, which occurs upon a match with the
CR000 register, or INTTM010, which occurs upon a match with the CR010
register, occurs.
If the external trigger occurs again while a one-shot pulse is output, it is ignored.
When using the one-shot pulse output of 16-bit timer/event counter 00 with a
software trigger, do not change the level of the TI000 pin or its alternate-function
port pin.
Because the external trigger is valid even in this case, the timer is cleared and
started even at the level of the TI000 pin or its alternate-function port pin, resulting
in the output of a pulse at an undesired timing.
APPENDIX D LIST OF CAUTIONS
User’s Manual U16227EJ3V0UD
Cautions
p. 157
p. 157
p. 158
p. 159
p. 160
p. 160
p. 160
p. 160
p. 160
p. 160
p. 160
p. 143
p. 152
p. 155
p. 155
p. 156
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