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Clock Generator Module (CGM)
Technical Data
MC68HC908JB16 鈥� Rev. 1.1
248
Clock Generator Module (CGM)
Freescale Semiconductor
13.2 Introduction
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.
NOTE:
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.
Addr.
Register Name
Bit 7
654321
Bit 0
$0051
PLL Bandwidth Control
Register
(PBWC)
Read:
R
LOCK1
R
PLLON1
R
LOCK2
R
PLLON2
Write:
Reset:
0000
$0052
VCO Control Register
(PVCR)
Read:
VCO_7
VCO_6
VCO_5
VCO_4
VCO_3
VCO_2
VCO_1
VCO_0
Write:
Reset:
00110000
$0053
PLL1 N & R Divider Select
Register High
(PNRH1)
Read:
VDS1_11 VDS1_10 VDS1_9
VDS1_8
00
RDS1_9
RDS1_8
Write:
Reset:
00100000
Figure 13-1. CGM I/O Register Summary
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