Timers
8-Bit Timer Description
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
77
Panasonic
4Timers

4.1 8-Bit Timer Description

The MN102H75K/85K contains four 8-bit timers that can serve as interval

timers, event timer/counters, clock generators (divide-by-2 output of the

underflow), reference clocks for the serial interfaces, or start timers for A/D con-

versions. The clock source can be the internal clock (oscillator frequency divided

by 2) or the external clock (1/4 or less the oscillator frequency input). A timer

interrupt is generated by a timer underflow .

All passages below assume a clock BOSC of 24 MHz. The 8-bit timers are cascadable into true 16-bit timers. For instance, if you

cascade timers 0 and 1, timer 0 sends cascaded output to timer 1. The result is

true 16-bit division, rather than two successive 8-bit divisions.

Figure 4-1 Timer Configuration Examples
Note: BOSC = 24 MHz
Figure 4-2 Block Diagram of 8-Bit Timers
Cascading Connections
8-bit x 4
16-bit 8-bit 8-bit 8-bit 8-bit 16-bit
Clock output
Interval
timer
Sync.
transfer
clock
UART
transfer
clock
Event
timer Event
timer
Configuration example
TM0UDIRTM1UDIRTM2UDIR
(To 16-bit timer, serial I/F)
(To 16-bit timer, serial I/F)
BOSC/4TM2
TMIA
TMIB
TMIC
TMID
UDF
TMIO
TM0ITM0
TMIA
TMIB
TMIC
TMID
UDF
TMIO
TM1
TMIA
TMIB
TMIC
TMID
UDF
TMIO
BOSC/64
BOSC/256
BOSC/512
TM3
TMIA
TMIB
TMIC
TMID
UDF
TMIO
TM1ITM1OTM0OTM3UDIR
A/D conversion start