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Status Flag Clearing Timing: After a status flag is read as 1 by the CPU, it is cleared by writing
0 to it. When the DTC is activated, the flag is cleared automatically. Figure 10.42 shows the
timing for status flag clearing by the CPU, and figure 10.43 shows the timing for status flag
clearing by the DTC.
Status flag
Write signal
Address
TSR address
Interrupt
request
signal
TSR write cycle
T1
T2
φ
Figure 10.42 Timing for Status Flag Clearing by CPU
Interrupt
request
signal
Status flag
Address
Source address
DTC
read cycle
T1
T2
Destination
address
T1
T2
DTC
write cycle
φ
Figure 10.43 Timing for Status Flag Clearing by DTC Activation
Содержание H8S/2627
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