mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 79

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

5.6 Mask Option Register (MOR)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor Configuration and Mask Option Registers (CONFIG & MOR)
Address:
SCIBDSRC — SCI Baud Rate Clock Source
The mask option register (MOR) is used for selecting one of the three
clock options for the MCU. The MOR is a byte located in FLASH
memory, and is written to by a FLASH programming routine.
OSCSEL1, OSCSEL0 — Oscillator Selection Bits
Bits 5–0 — Should be left as 1’s.
Erased:
Reset:
Read:
Write:
SCIBDSRC selects the clock source used for the SCI. The setting of
this bit affects the frequency at which the SCI operates.
OSCSEL1 and OSCSEL0 select which oscillator is used for the MCU
CGMXCLK clock. The erase state of these two bits is logic 1. These
bits are unaffected by reset. (See
1 = Internal data bus clock, f
0 = Oscillator clock, CGMXCLK, is used as clock source for SCI
OSCSEL1 OSCSEL0
$FF80
Bit 7
U
R
1
Figure 5-4. Mask Option Register (MOR)
= Reserved
U
6
1
Configuration and Mask Option Registers (CONFIG & MOR)
R
U
5
1
BUS
R
U
4
1
Table
, is used as clock source for SCI
R
U
3
1
5-1).
Mask Option Register (MOR)
R
U
2
1
R
U
1
1
Data Sheet
Bit 0
R
U
1
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