HD64336901G Renesas Technology, HD64336901G Datasheet - Page 102

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

Rev. 1.00, 11/03, page 74 of 376
(LSI operates on internal RC clock)
LSI operates on internal oscillator
Write 0 to OSCBAKE in CKCSR
Figure 5.5 Flowchart of Clock Switching with Backup Function Disabled (2)
Write 1 to CKSWIE in CKCSR
Write 0 to OSCSEL in CKCSR
Write 0 to PMRC0 in CKCSR
if necessary
if necessary
Start
When CKSWIE = 1
(From External Clock to Internal RC Clock)
Exception handling
for clock switching
LSI operates on
internal RC clock
LSI operates on
internal RC clock
[1]
[2]
[1] When 0 is written to the OSCSEL bit, this LSI
[2] Writing 0 to PMRC0 stops the external oscillation.
switches the external clock to the internal RC clock
after the
included in the
RC
clock after the OSCSEL bit becomes 0 are
stop duration. Seven rising edges of the
stop duration.