10 setting up external reset control using timer 5, Timers, 4 as the clock source – Lucent Technologies MN10285K User Manual
Page 124
Timers
16-Bit Timer Setup Examples
MN102H75K/F75K/85K/F85K LSI User Manual
Panasonic Semiconductor Development Company
123
Panasonic
4.11.10 Setting Up External Reset Control Using Timer 5
In this example, timer 5 is reset by an external signal while counting up.
■
To set up timer 5:
Use the MOV instruction to set
this data and only use 16-bit
write operations.
This step stops the TM5BC
count and clears both TM5BC
and the S-R flip-flop to 0.
1.
Set the operating mode in the timer 5 mode register (TM5MD). Disable
timer 5 counting and interrupts. Select up counting. Since the TM5IC signal
will reset the counter asynchronously, set the TM5ECLR bit to 1. Select
B
OSC
/4 as the clock source.
TM5MD (example)
x’00FE90’
2.
Set the value to which timer 5 will loop (valid settings: x’0001’ to x’FFFF’).
For TM5BC to count from x’0000’ to x’1FFF’, for instance, write x’1FFF’
to TM5CA.
A. Chip Level
B. Block Level
Figure 4-52 Block Diagram of External Reset Control Using Timer 5
TM5IC
P3
P5
CORE
Interrupts
Timers 0-3
Timers 4-5
ROM, RAM
Bus Controller
Serial I/Fs
ADC
P2
P6
P4
reset
TM5BC
Timer 5
TM5CA
TM5CB
TM5IC
B
OSC
/4
T
Q
T
Q
R
S
Q
Controller
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TM5
EN
TM5
NLD
—
—
TM5
UD1
TM5
UD0
TM5
TGE
TM5
ONE
TM5
MD1
TM5
MD0
TM5
ECLR
TM5
LP
TM5
ASEL
TM5
S2
TM5
S1
TM5
S0
Setting:
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1