Rev. 1.0, 09/03, page 258 of 568
11.8 Usage
Notes
11.8.1
Conflict between TCNT Write and Clear
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the clear
takes priority, so that the counter is cleared and the write is not performed. Figure 11.10 shows
this operation.
φ
Address
TCNT address
Internal write signal
Counter clear signal
TCNT
N
H'00
T
1
T
2
TCNT write cycle by CPU
Figure 11.10 Conflict between TCNT Write and Clear
11.8.2
Conflict between TCNT Write and Increment
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the write
takes priority and the counter is not incremented. Figure 11.11 shows this operation.
Summary of Contents for H8S/2627
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