r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 841

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

13.5.5
TCNT is cleared at the rising edge, falling edge, low level, or high level of an external reset input,
depending on the settings of the CCLR1 and CCLR0 bits in TCR and the TMRIS bit in TCCR.
The clear pulse width must be at least 1.5 states for a single edge and at least 2.5 states for both
edges. Figure 13.9 shows the timing of this operation.
13.5.6
The OVF in TCSR is set to 1 when TCNT overflows (changes from H'FF to H'00). Figure 13.10
shows the timing of this operation.
φ
External reset
input pin
Clear signal
TCNT
Timing of TCNT External Reset
Timing of Overflow Flag (OVF) Setting
φ
TCNT
Overflow signal
OVF
Figure 13.9 Timing of Clearance by External Reset
Figure 13.10 Timing of OVF Setting
N – 1
H'FF
Rev. 1.00 Sep. 19, 2008 Page 813 of 1270
N
H'00
Section 13 8-Bit Timers (TMR)
H'00
REJ09B0466-0100