HD643303x Hitachi, HD643303x Datasheet - Page 271

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

Contention between TCNT Byte Write and Increment: If an increment pulse occurs in the T
or T
TCNT byte that was not written retains its previous value. See figure 8-63, which shows an
increment pulse occurring in the T
3
state of a TCNT byte write cycle, writing takes priority and TCNT is not incremented. The
ø
Address
Internal write signal
TCNT input clock
TCNTH
TCNTL
Figure 8-63 Contention between TCNT Byte Write and Increment
2
state of a byte write to TCNTH.
T
TCNTH byte write cycle
1
N
X
256
TCNTH address
TCNTH write data
T
2
X + 1
T
3
M
X
2