M16C1N Datasheet, PDF (222/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
20. Precautionary Notes in Using the Device
20.3.5 Timer Z
1. When count is stopped by writing "0" to the timer Z count start flag, the timer reloads the value of
reload register and stops. Therefore, the timer count value should be read out before the timer
stops.
2. When count is stopped by writing "0" to the timer Z count start flag (all modes) or by writing "0" to
the one-shot start bit (programmable one-shot generation mode/programmable wait one-shot gen-
eration mode), the timer Z interrupt request flag becomes "1" and an interrupt occurs. Thus, disable
interrupts before the timer stops. Furthermore, set the Timer Z interrupt request bit to "0" before
starting counting again.
20.3.6 Timer C
1. Read out the timer C or timer measurement register using in word-size.
Even if the Timer C is read out in word-size, the timer value is not updated during the period the
high-byte and low-byte are being read.
Example:
MOV.W
0091H,R0 ;Read out timer C
Rev.1.00 Oct 20, 2004 page 210 of 222
REJ090007-0100Z