h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 382

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 8-Bit Timers
12.3.3
TCNT is cleared at the rising edge of an external reset input, depending on the settings of the
CCLR1 and CCLR0 bits in TCR. The width of the clearing pulse must be at least 1.5 states. Figure
12.7 shows the timing of this operation.
12.3.4
OVF in TCSR is set to 1 when the timer count overflows (changes from H'FF to H'00). Figure
12.8 shows the timing of this operation.
Rev. 4.00 Jun 06, 2006 page 328 of 1004
REJ09B0301-0400
External reset
input pin
Clear signal
TCNT
TCNT External Reset Timing
Timing of Overflow Flag (OVF) Setting
TCNT
Overflow signal
OVF
Figure 12.7 Timing of Clearing by External Reset Input
Figure 12.8 Timing of OVF Setting
N – 1
H'FF
N
H'00
H'00