m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 130

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.7 Frequency synthesizer (PLL)
Figure 2.7.1. Frequency synthesizer circuit block diagram
Figure 2.7.2. Memory map of frequency synthesizer related registers
This paragraph explains the registers setting method and the notes related to the frequency synthesizer
(PLL circuit).
2.7.1 Overview
The frequency synthesizer generates the 48MHz clock that is necessary for the USB block and the f
clock. These clocks are a multiple of the external input standard clock f(X
frequency synthesizer circuit block diagram.
f(X
(1) Related Registers
Figure 2.7.2 shows a memory location diagram for the frequency synthesizer related registers; Fig-
ures 2.7.3 and 2.7.4 show the composition of the frequency synthesizer related registers.
IN
(03DE
)
16
)
Prescaler
03DB
03DC
03DD
03DE
03DF
000A
FSP
page 121 of 354
16
16
16
16
16
16
Protect register (PRCR)
Frequency synthesizer clock control register (FSCCR)
Frequency synthesizer control register (FSC)
Frequency synthesizer multiply register (FSM)
Frequency synthesizer prescaler register (FSP)
Frequency synthesizer divide register (FSD)
f
(03DD
PIN
16
)
FSM
Frequency
Multiplier
Data Bus
(03DC
16
f
VCO
)
FSC
LS
(03DF
Frequency
16
Divider
)
FSD
EN
USBC5
8 Bit
2. Frequency synthesizer (PLL)
IN
). Figure 2.7.1 shows the
FSCCR
f
USB
(03DB
FSCCR0
16
f
SYN
)
SYN