HD6432646 Hitachi, HD6432646 Datasheet - Page 409
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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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 10-46 shows the
timing for status flag clearing by the CPU, and figure 10-47 shows the timing for status flag
clearing by the DTC.
ø
Address
Status flag
Interrupt
request
signal
ø
Address
Write signal
Status flag
Interrupt
request
signal
Figure 10-47 Timing for Status Flag Clearing by DTC Activation
Figure 10-46 Timing for Status Flag Clearing by CPU
TSR write cycle
Source address
T1
TSR address
T1
read cycle
DTC
T2
T2
T1
write cycle
Destination
address
DTC
T2
375
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