r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 781

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

(4)
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 11.43 shows the timing for status flag
clearing by the CPU, and figure 11.44 shows the timing for status flag clearing by the DTC or
DMAC.
Status Flag Clearing Timing
Address
Status flag
Interrupt
request
signal
Address
Write signal
Status flag
Interrupt
request
signal
φ
Figure 11.44 Timing for Status Flag Clearing by DTC/DMAC Activation
φ
Figure 11.43 Timing for Status Flag Clearing by CPU
TSR write cycle
Source address
T
TSR address
T
DTC/DMAC
read cycle
1
1
T
T
2
2
Rev. 1.00 Sep. 19, 2008 Page 751 of 1342
Section 11 16-Bit Timer Pulse Unit (TPU)
T
DTC/DMAC
write cycle
Destination
1
address
T
2
REJ09B0467-0100