HD6412350 Hitachi, HD6412350 Datasheet - Page 497

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

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 or DMAC 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 or DMAC.
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/DMAC Activation
Figure 10-46 Timing for Status Flag Clearing by CPU
TSR write cycle
Source address
T1
TSR address
T1
DTC/DMAC
read cycle
T2
T2
DTC/DMAC
T1
write cycle
Destination
address
T2
477