DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 660

• 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

Rev.7.00 Dec. 24, 2008 Page 606 of 698
REJ09B0074-0700
External
clock 1
External
clock 2
Operation
Port setting
External clock
switchover
signal
EXTAL
Internal
clock φ
External
interrupt
Clock switchover
request
Figure 19.12 Example of External Clock Switchover Timing
Figure 19.11 Example of External Clock Switching Circuit
(1)
Control
cycle
(1)
(2)
(3)
(4)
(5)
SLEEP instruction
External clock 1
External clock 2
Active (external clock 2)
Port setting (clock switchover)
Software standby mode transition
External clock switchover
External interrupt generation
(Input interrupt at least 200 ns after transition to software standby mode.)
Interrupt exception handling
execution
Request switchover of external clock
External clock switchover signal
(2)
Interrupted external signal
200 ns or more
(3)
Software standby mode
(4)
Wait time
Ouptut port
External
interrupt
EXTAL
This LSI
Interrupt exception handling
(5)
Active (external clock 1)