HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 689

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

18.7.17 Conflict between TCNT Write and Overflow/Underflow
If there is an up-count or down-count in the T2 state of a TCNT write cycle, and
overflow/underflow occurs, the TCNT write takes precedence and the TCFV/TCFU flag in TSR is
not set.
Figure 18.84 shows the operation timing when there is conflict between TCNT write and
overflow.
TCNT input
clock
TCNT
Counter clear
signal
TGF
TCFV
Pφ
Figure 18.83 Conflict between Overflow and Counter Clearing
Address
Write signal
TCNT
TCFV flag
Pφ
Figure 18.84 Conflict between TCNT Write and Overflow
H'FFFF
Disabled
H'FFFF
TCNT write cycle
T1
TCNT address
Section 18 Multi-Function Timer Pulse Unit (MTU)
T2
Rev. 4.00 Sep. 14, 2005 Page 639 of 982
H'0000
M
TCNT write data
REJ09B0023-0400