MC908GR16ACFA FREESCALE [Freescale Semiconductor, Inc], MC908GR16ACFA Datasheet - Page 212

• Manufacturer Part Number: MC908GR16ACFA
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Timebase Module (TBM)
17.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
where:
212
FROM CGM MODULE
f
Divider
CGMXCLK
FROM CONFIG2
TBMCLKSEL
CGMXCLK
= Frequency supplied from the clock generator (CGM) module
= Divider value as determined by TBR2–TBR0 settings and TBMCLKSEL, see
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
Figure 17-1. Timebase Block Diagram
÷ 2
MC68HC908GR16A Data Sheet, Rev. 1.0
t
TBMRATE
DIVIDE BY 128
PRESCALER
÷ 2
÷ 2
÷ 2
=
---------------------------
f
÷ 2
CGMXCLK
÷ 2
Divider
÷ 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
TBIF
Table 17-1
TBMINT
TBIE