mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 134

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGM)
8.6.5 PLL Reference Divider Select Register
Data Sheet
134
NOTE:
NOTE:
Address:
The PLL reference divider select register (PMDS) contains the
programming information for the modulo reference divider.
RDS[3:0] — Reference Divider Select Bits
The reference divider select bits have built-in protection such that they
cannot be written when the PLL is on (PLLON = 1).
The default divide value of 1 is recommended for all applications.
Reset:
Read:
Write:
These read/write bits control the modulo reference divider that selects
the reference division factor, R. (See
Programming the
PLLON bit in the PCTL is set. A value of $00 in the reference divider
select register configures the reference divider the same as a value of
$01. (See
initializes the register to $01 for a default divide value of 1.
Figure 8-9. PLL Reference Divider Select Register (PMDS)
$003B
Bit 7
0
0
Clock Generator Module (CGM)
8.4.7 Special Programming
= Unimplemented
6
0
0
PLL.) RDS[3:0] cannot be written when the
5
0
0
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
4
0
0
8.4.3 PLL Circuits
RDS3
3
0
Exceptions.) Reset
RDS2
Freescale Semiconductor
2
0
RDS1
1
0
and
8.4.6
RDS0
Bit 0
1