mc68hc908qz16 Freescale Semiconductor, Inc, mc68hc908qz16 Datasheet - Page 252

• Manufacturer Part Number: mc68hc908qz16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Timebase Module (TBM)
18.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
where:
252
FROM CGM MODULE
f
Divider = Divider value as determined by TBR2–TBR0 settings, see
TBMCLK
FROM CONFIG2
TBMCLKSEL
CGMXCLK
= Frequency supplied from the clock generator (CGM) module
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
t
TBMRATE
÷ 2
Figure 18-1. Timebase Block Diagram
÷ 2
DIVIDE BY 128
PRESCALER
÷ 2
=
÷ 2
÷ 2
-------------------------- -
f
TBMRATE
1
÷ 2
÷ 2
=
÷ 2
÷ 2
---------------------- -
f
Divider
TBMCLK
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 18-1
TBMCLK
TBON
Freescale Semiconductor
R
TBIF
TBMINT
TBIE