mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 248

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGM)
13.2 Introduction
Technical Data
248
Addr.
$0051
$0052
$0053
PLL1 N & R Divider Select
PLL Bandwidth Control
VCO Control Register
Register Name
NOTE:
Register High
(PNRH1)
Register
(PBWC)
(PVCR)
13.10 Pre-Defined VCO Output Frequency Settings . . . . . . . . . . . . 260
13.11 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
13.11.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
13.11.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
This section describes the clock generation module (CGM). The CGM
operates at the frequency of the crystal, OSCXCLK, and generates
frequencies in the 27MHz range. This frequency range is targeted for RF
applications, such as in a local oscillator in a down conversion mixer
receiver.
This particular MCU has two clock generation modules which are
denoted as CGM1 and CGM2. Each CGM contains all the functional
blocks for PLL control of a VCO.
References to either CGM1 or CGM2 may be made in the following text
by omitting the CGM number. For example, CGMOUT may refer
generically to CGMOUT1 and CGMOUT2, and LOCK bit may refer to
LOCK1 and LOCK2 bits.
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Figure 13-1. CGM I/O Register Summary
VDS1_11 VDS1_10
VCO_7
Bit 7
R
0
0
Clock Generator Module (CGM)
LOCK1
VCO_6
6
0
0
0
VDS1_9
VCO_5
R
5
1
1
PLLON1
VDS1_8
VCO_4
4
0
1
0
VCO_3
R
3
0
0
0
MC68HC908JB16
LOCK2
VCO_2
Freescale Semiconductor
0
0
0
0
2
RDS1_9
VCO_1
R
1
0
0
—
PLLON2
RDS1_8
Rev. 1.1
VCO_0
Bit 0
0
0
0