mc68hc05pv8a Freescale Semiconductor, Inc, mc68hc05pv8a Datasheet - Page 120

• Manufacturer Part Number: mc68hc05pv8a
• Description: Mc68hc05pv8a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Technical Data
Technical Data
RT1:RT0
00
01
10
11
131.072ms
262.144ms
32.768ms
65.536ms
500 kHz
RTOF – Reset TOF
RRTIF – Reset RTIF
RT1, RT0 – Real Time Interrupt Rate Select
This bit always reads 0. Setting this bit clears the timer overflow flag
(TOF). Clearing this bit has no effect.
This bit always reads 0. Setting this bit clears the real time interrupt
flag (RTIF). Clearing this bit has no effect.
These two bits select one of four taps from the real time interrupt
circuit.
values. Reset sets these RT0 and RT1, selecting the lowest periodic
rate and therefore the maximum time in which to alter these bits if
necessary. Care should be taken when altering RT0 and RT1 if the
time-out period is imminent or uncertain. If the selected tap is modified
during a cycle in which the counter is switching an RTIF could be
missed or an additional one could be generated. To avoid problems
the COP should be cleared before changing RTI taps.
Freescale Semiconductor, Inc.
For More Information On This Product,
RTI Rates at Bus Frequency f
Table 8-1
1.000 MHz
131.072ms
16.384ms
32.768ms
65.536ms
Table 8-1 RTI Rates
Go to: www.freescale.com
Core Timer
shows the available interrupt rates with several f
2.000 MHz
16.384ms
32.768ms
65.536ms
8.192ms
OP
2.4576 MHz
13.333ms
26.667ms
53.333ms
specified:
6.667ms
MC68HC(8)05PV8/A — Rev. 1.9
RATIO
2
2
2
2
14
15
16
17
/f
/f
/f
/f
op
op
op
op
op