DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 384

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

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 DMAC is activated, the flag is cleared automatically. Figure 9.42 shows the
timing for status flag clearing by the CPU, and figure 9.43 shows the timing for status flag clearing
by the DMAC.
Rev.7.00 Dec. 24, 2008 Page 330 of 698
REJ09B0074-0700
Address
Status flag
Interrupt
request
signal
φ
Address
Write signal
Status flag
Interrupt
request
signal
φ
Figure 9.43 Timing for Status Flag Clearing by DMAC Activation
Figure 9.42 Timing for Status Flag Clearing by CPU
TSR write cycle
Source address
TSR address
T
T
read cycle
1
1
DMAC
T
T
2
2
T
write cycle
Destination
1
DMAC
address
T
2