HD6432621 Hitachi, HD6432621 Datasheet - Page 720

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

20.1.1
Figure 20-1 shows a block diagram of the clock pulse generator.
20.1.2
The clock pulse generator is controlled by SCKCR and LPWRCR. Table 20-1 shows the register
configuration.
Table 20-1 Clock Pulse Generator Register
Name
System clock control register
Low-power control register
Note:* Lower 16 bits of the address.
676
EXTAL
XTAL
OSC1
OSC2
Legend:
LPWRCR:
SCKCR:
Note: * Supported only in the H8S/2626 Series, not available in the H8S/2623 Series.
Block Diagram
Register Configuration
Low-power control register
System clock control register
oscillator*
oscillator
Subclock
System
clock
Figure 20-1 Block Diagram of Clock Pulse Generator
( 1, 2, 4)
PLL circuit
Waveform
LPWRCR
shaping
circuit*
WDT1 count clock
STC1, STC0
Abbreviation
SCKCR
LPWRCR
ø SUB
selection
circuit
Clock
System clock
to ø pin
R/W
R/W
R/W
clock divider
Medium-
speed
supporting modules
Internal clock to
Initial Value
H'00
H'00
ø/2 to
ø/32
ø
selection
SCKCR
master
circuit
clock
Bus
Bus master clock
to CPU and DTC
SCK2 to SCK0
Address*
H'FDE6
H'FDEC