R8C/1A Group, R8C/1B Group
14. Timers
Rev.1.30
Dec 08, 2006
Page 140 of 315
REJ09B0252-0130
14.2.5
Notes on Timer Z
• Timer Z stops counting after a reset. Set the values in the timer and prescaler before the count starts.
• Even if the prescaler and timer are read out in 16-bit units, these registers are read 1 byte at a time by the
MCU. Consequently, the timer value may be updated during the period when these two registers are being
read.
• Do not rewrite bits TZMOD0 to TZMOD1, and the TZS bit simultaneously.
• In programmable one-shot generation mode, and programmable wait one-shot generation mode, when
setting the TZS bit in the TZMR register to 0 (stops counting) or setting the TZOS bit in the TZOC register
to 0 (stops one-shot), the timer reloads the value of the reload register and stops. Therefore, in
programmable one-shot generation mode and programmable wait one-shot generation mode read the timer
count value before the timer stops.
• The TZS bit in the TZMR register has a function to instruct timer Z to start or stop counting and a function
to indicate that the count has started or stopped.
0 (count stops) can be read until the following count source is applied after 1 (count starts) is written to the
TZS bit while the count is being stopped. If the following count source is applied, 1 can be read from the
TZS bit. After writing 1 to the TZS bit, do not access registers associated with timer Z (registers TZMR,
PREZ, TZSC, TZPR, TZOC, PUM, TCSC, and TZIC) except for the TZS bit, until 1 can be read from the
TZS bit. The count starts at the following count source after the TZS bit is set to 1.
Also, after writing 0 (count stops) to the TZS bit during the count, timer Z stops counting at the following
count source.
1 (count starts) can be read by reading the TZS bit until the count stops after writing 0 to the TZS bit. After
writing 0 to the TZS bit, do not access registers associated with timer Z except for the TZS bit, until 0 can
be read from the TZS bit.
