Lucent Technologies MN10285K User Manual
Timers
8-Bit Timer Description
MN102H75K/F75K/85K/F85K LSI User Manual
Panasonic Semiconductor Development Company
77
Panasonic
4
Timers
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-
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
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 B
OSC
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.
true 16-bit division, rather than two successive 8-bit divisions.
Figure 4-1 Timer Configuration Examples
Note:
B
OSC
= 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
TM0UDIR
TM1UDIR
TM1UDIR
TM2UDIR
(To 16-bit timer, serial I/F)
(To 16-bit timer, serial I/F)
B
OSC
/4
TM2
TMIA
TMIB
TMIC
TMID
TMIB
TMIC
TMID
UDF
TMIO
TM0I
TM0
TMIA
TMIB
TMIC
TMID
TMIB
TMIC
TMID
UDF
TMIO
TM1
TMIA
TMIB
TMIC
TMID
TMIB
TMIC
TMID
UDF
TMIO
B
OSC
/64
B
OSC
/256
B
OSC
/512
TM3
TMIA
TMIB
TMIC
TMID
TMIB
TMIC
TMID
UDF
TMIO
TM1I
TM1O
TM0O
TM3UDIR
A/D conversion start