HD6432670 Hitachi, HD6432670 Datasheet - Page 623

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

11.10.11 Contention between Overflow/Underflow and Counter Clearing
If overflow/underflow and counter clearing occur simultaneously, the TCFV/TCFU flag in TSR is
not set and TCNT clearing takes precedence.
Figure 11.52 shows the operation timing when a TGR compare match is specified as the clearing
source, and H'FFFF is set in TGR.
Figure 11.51 Contention between Buffer Register Write and Input Capture
ø
Address
Write signal
Input capture
signal
TCNT
TGR
Buffer
register
Figure 11.52 Contention between Overflow and Counter Clearing
TCNT input
clock
TCNT
Counter
clearing signal
TGF
TCFV
ø
H'FFFF
Disabled
Buffer register write cycle
M
Buffer register
T1
address
N
T2
H'0000
M
N
Rev. 2.0, 04/02, page 577 of 906