Overview Of Cpg; Block Diagram Of Cpg; Figure 10.1(1) Block Diagram Of Cpg (Sh7751) - Hitachi SH7751 Hardware Manual

10.2

Overview of CPG

10.2.1

Block Diagram of CPG

Figures 10.1(1) and 10.1(2) show a block diagram of the CPG in the SH7751 and SH7751R.
Oscillator circuit
Crystal
XTAL
oscillator
EXTAL
MD8
CKIO
CPG control unit
MD2
MD1
MD0
FRQCR: Frequency control register
STBCR: Standby control register
STBCR2: Standby control register 2
PLL circuit 1
× 6
Frequency
divider 1
× 1/2
PLL circuit 2
× 1
Clock frequency
control circuit
FRQCR
Bus interface
Internal bus

Figure 10.1(1) Block Diagram of CPG (SH7751)

Frequency
divider 2
× 1
× 1/2
× 1/3
× 1/4
× 1/6
× 1/8
Standby control
circuit
STBCR
STBCR2
Rev. 3.0, 04/02, page 243 of 1064
CPU clock (Iø)
cycle Icyc
Peripheral module
clock (Pø) cycle
Pcyc
Bus clock (Bø)
cycle Bcyc