s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 222

• Manufacturer Part Number: s908gr32ag3vfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Timebase Module (TBM)
16.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
where:
222
FROM CGM MODULE
f
Divider = Divider value as determined by TBR2–TBR0 settings and TMBCLKSEL, see
CGMXCLK
FROM CONFIG2
TMBCLKSEL
CGMXCLK
= Frequency supplied from the clock generator (CGM) module
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
÷ 2
÷ 2
÷ 2
÷ 2
t
TBMRATE
÷ 2
÷ 2
÷ 2
Figure 16-1. Timebase Block Diagram
÷ 2
=
DIVIDE BY 128
PRESCALER
÷ 2
f
CGMXCLK
Divider
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
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
TBMCLK
TBON
Freescale Semiconductor
R
Table 16-1
TBIF
TBMINT
TBIE