HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 123

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

3.1
Operation of the on-chip clock pulse generator, and CS0 area bus width specification, are
controlled by the operating mode pins. A crystal resonator or external clock can be selected as the
clock source.
3.2
3.2.1
A block diagram of the on-chip clock pulse generator circuit is shown in figure 3.1.
CKPREQ/CKM
Note: See section 20.4.4, Clock Pause Function.
Section 3 Oscillator Circuits and Operating Modes
CKPACK*
Overview
On-Chip Clock Pulse Generator and Operating Modes
Clock Pulse Generator
EXTAL
CAP1
CAP2
XTAL
CKIO
MD2
MD1
MD0
Figure 3.1 Block Diagram of Clock Pulse Generator Circuit
Oscillator
On/Off
Clock mode control circuit
PLL circuit 2
1, 2, 4
PLL circuit 1
The relationship between the
internal clock frequencies is:
I
Maximum frequencies are:
I , E
DIVM
DIVE
DIVP
E
1/1
1/2
1/4
1/1
1/2
1/4
1/1
1/2
1/4
60 MHz, P
P .
E
External interface
clock
I
CPU/DSP core
clock
P
Peripheral module
clock
system clock
30 MHz.
105