Section 10 16-Bit Timer Pulse Unit (TPU)
Rev. 1.00 Apr. 28, 2008 Page 298 of 994
REJ09B0452-0100
10.8.3 Conflict
between
TCNT
Write and Clear Operations
If the counter clear signal is generated in the T
2
state of a TCNT write cycle, TCNT clearing takes
precedence and the TCNT write is not performed. Figure 10.44 shows the timing in this case.
Counter clear
signal
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T1
T2
N
H'0000
Figure 10.44 Conflict between TCNT Write and Clear Operations
10.8.4
Conflict between TCNT Write and Increment Operations
If incrementing occurs in the T
2
state of a TCNT write cycle, the TCNT write takes precedence
and TCNT is not incremented. Figure 10.45 shows the timing in this case.
TCNT input
clock
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T1
T2
N
M
TCNT write data
Figure 10.45 Conflict between TCNT Write and Increment Operations
Содержание H8S/2100 Series
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