mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 218

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

Timebase Module (TBM)
17.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
where:
218
FROM CGM MODULE
f
Divider = Divider value as determined by TBR2–TBR0 settings, see
TBMCLK
FROM CONFIG2
TMBCLKSEL
CGMXCLK
=Frequency supplied from the clock generator (CGM) module
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
t
TBMRATE
÷ 2
Figure 17-1. Timebase Block Diagram
÷ 2
MC68HC908GR16 Data Sheet, Rev. 5.0
DIVIDE BY 128
PRESCALER
÷ 2
=
÷ 2
------------------------------- -
f
÷ 2
TBMRATE
1
÷ 2
÷ 2
÷ 2
=
÷ 2
--------------------------- -
f
TBMCLK
Divider
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0
1
Table 17-1
TBMCLK
TBON
Freescale Semiconductor
R
TBIF
TBMINT
TBIE