MC68908GZ8MFJE Datasheet, PDF (252/314 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timebase Module (TBM)
TBMCLKSEL
FROM CONFIG2
CGMXCLK
FROM CGM MODULE
DIVIDE BY 128
PRESCALER
÷2 ÷2 ÷2
÷2
÷2
÷2
÷2
0
TBMCLK
1
TBON
TBMINT
÷2 ÷2 ÷2 ÷2
÷2 ÷2
÷2 ÷2
000
R
001
010
011
100
101
110
111
Figure 18-1. Timebase Block Diagram
18.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
t_TBMRATE
=
------------1--------------
f_TBMRATE
=
--D----i--v---i--d----e----r-
f_TBMCLK
where:
f_TBMCLK= Frequency supplied from the clock generator (CGM) module
Divider = Divider value as determined by TBR2–TBR0 settings, see Table 18-1
TBIF
TBIE
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
252
Freescale Semiconductor