SH7727 Datasheet, PDF (331/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

10.2 Overview of the CPG
Section 10 On-Chip Oscillation Circuits
10.2.1 CPG Block Diagram
A block diagram of the on-chip clock pulse generator is shown in figure 10.1.
CAP1
CKIO2
CKIO
Cycle = Bcyc
CAP2
XTAL
EXTAL
Crystal
oscillator
Clock pulse generator
PLL circuit 1
(× 1, 2, 3, 4, 6)
PLL circuit 2
(× 1, 4)
Divider 1
×1
× 1/2
× 1/3
×1/4
Divider 2
×1
× 1/2
× 1/3
× 1/4
× 1/6
Internal
clock (Iφ)
Cycle = Icyc
Peripheral
clock (Pφ)
Cycle = Pcyc
Bus clock (Pφ)
Cycle = Bcyc
MD2
MD1
MD0
CPG control unit
Clock frequency
control circuit
Standby control
circuit
FRQCR
STBCR
Standby
control
Bus interface
Legend:
FRQCR: Frequency control register
Internal bus
STBCR: Standby control register
Figure 10.1 Block Diagram of Clock Pulse Generator
Rev. 5.00 Dec 12, 2005 page 259 of 1034
REJ09B0254-0500