HD64F36024FX Datasheet, PDF (176/386 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 11 Timer W
11.4 Operation
The timer W has the following operating modes.
• Normal Operation
• PWM Operation
11.4.1 Normal Operation
TCNT performs free-running or periodic counting operations. After a reset, TCNT is set as a free-
running counter. When the CTS bit in TMRW is set to 1, TCNT starts incrementing the count.
When the count overflows from H'FFFF to H'0000, the OVF flag in TSRW is set to 1. If the OVIE
in TIERW is set to 1, an interrupt request is generated. Figure 11.2 shows free-running counting.
TCNT value
H'FFFF
H'0000
Time
CTS bit
OVF
Flag cleared
by software
Figure 11.2 Free-Running Counter Operation
Rev. 4.00 Sep. 23, 2005 Page 148 of 354
REJ09B0025-0400