HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 280

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Table 9.19 Internal Clock Switching and FRC Operation (cont)
No.
3
4
Note: * The switchover is seen as a falling edge, and FRC is incremented.
272
Clock Levels Before
and After Modifying
Bits CKS1 and CKS0
Goes from high level
to low level
Goes from high to high
FRC Operation
Clock before
switching
Clock after
switching
Count clock
FRC
Clock before
switching
Clock after
switching
Count clock
FRC
N
N
Write to CKS1 and CKS0
N + 1
N + 1
*
Write to CKS1 and CKS0
N + 2
N + 2