mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 80

• Manufacturer Part Number: mc68hc908gr16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Configuration Register (CONFIG)
TMBCLKSEL— Timebase Clock Select Bit
OSCENINSTOP — Oscillator Enable In Stop Mode Bit
ESCIBDSRC — SCI Baud Rate Clock Source Bit
COPRS — COP Rate Select Bit
LVISTOP — LVI Enable in Stop Mode Bit
80
TMBCLKSEL enables an extra divide-by-128 prescaler in the timebase module. Setting this bit enables
the extra prescaler and clearing this bit disables it. See
a more detailed description of the external clock operation.
OSCENINSTOP, when set, will enable oscillator to continue to generate clocks in stop mode. See
Chapter 4 Clock Generator Module
the reset of the MCU stops. See
to generate clocks while in stop mode. The default state for this option is clear, disabling the oscillator
in stop mode.
ESCIBDSRC controls the clock source used for the serial communications interface (SCI). The setting
of this bit affects the frequency at which the SCI operates.See
Communications Interface (ESCI)
COPD selects the COP timeout period. Reset clears COPRS. See
Properly (COP) Module
When the LVIPWRD bit is clear, setting the LVISTOP bit enables the LVI to operate during stop mode.
Reset clears LVISTOP.
1 = Enables extra divide-by-128 prescaler in timebase module
0 = Disables extra divide-by-128 prescaler in timebase module
1 = Oscillator enabled to operate during stop mode
0 = Oscillator disabled during stop mode (default)
1 = Internal data bus clock used as clock source for SCI (default)
0 = External oscillator used as clock source for SCI
1 = COP timeout period = 8176 CGMXCLK cycles
0 = COP timeout period = 262,128 CGMXCLK cycles
1 = LVI enabled during stop mode
0 = LVI disabled during stop mode
Note: LVI5OR3 bit is only reset via POR (power-on reset)
Address:
Address:
Reset:
Reset:
Read:
Read:
Write:
Write:
COPRS
$001E
$001F
Bit 7
Bit 7
0
0
0
Figure 5-1. Configuration Register 2 (CONFIG2)
Figure 5-2. Configuration Register 1 (CONFIG1)
= Unimplemented
LVISTOP
6
0
0
6
0
Chapter 17 Timebase Module
MC68HC908GR16 Data Sheet, Rev. 5.0
Module.
(CGM). This function is used to keep the timebase running while
LVIRSTD
5
0
0
5
0
LVIPWRD
R
4
0
0
4
0
= Reserved
Chapter 4 Clock Generator Module (CGM)
LVI5OR3
See note
R
3
0
3
(TBM). When clear, oscillator will cease
Chapter 14 Enhanced Serial
TMBCLK-
SSREC
SEL
2
0
2
0
Chapter 6 Computer Operating
OSCEN-
INSTOP
STOP
1
0
1
0
Freescale Semiconductor
ESCIBD-
COPD
SRC
Bit 0
Bit 0
1
0
for