h8s2277 Renesas Electronics Corporation., h8s2277 Datasheet - Page 338

• Manufacturer Part Number: h8s2277
• Description: Hitachi Single-chip Microcomputer H8s/2276 Series
• Manufacturer: Renesas Electronics Corporation.

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 10.43 shows the
timing for status flag clearing by the CPU, and figure 10.44 shows the timing for status flag
clearing by the DTC.
316
ø
Address
Status flag
Interrupt
request
signal
ø
Address
Write signal
Status flag
Interrupt
request
signal
Figure 10.44 Timing for Status Flag Clearing by DTC Activation
Figure 10.43 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