Lucent Technologies MN10285K User Manual
Timers
16-Bit Timer Setup Examples
Panasonic Semiconductor Development Company
MN102H75K/F75K/85K/F85K LSI User Manual
96
Panasonic
4.11.2 Setting Up a Single-Phase PWM Output Signal Using
Timer 4
In this example, timer 4 is used to divide B
OSC
by 5 and generate a five-cycle,
single-phase PWM signal. The duty of this signal is 2:3. To accomplish this, the
program must load the divide-by ratio of 5 (actual setting: 4) into compare/
capture register A and a cycle count of 2 (actual setting: 1) into compare/capture
capture register A and a cycle count of 2 (actual setting: 1) into compare/capture
register B.
■
To set up the output port:
Set the P2MD[13:12] bits of the port 2 output mode register (P2MD) to b’01’
(selecting the TM4IOA pin) and set the P2DIR6 bit of the port 2 I/O control
(selecting the TM4IOA pin) and set the P2DIR6 bit of the port 2 I/O control
register (P2DIR) to 1 (selecting output direction). This step selects the TM4OA
pin (P26) as the timer output port.
pin (P26) as the timer output port.
P2MD (example)
x’00FFF4’
A. Chip Level
B. Block Level
Figure 4-29 Block Diagram of Single-Phase PWM Output Using Timer 4
TM4OA
P3
P6
PC
P4
P5
CORE
Interrupts
Timers 0-3
Timers 4-5
ROM, RAM
Bus Controller
Serial I/Fs
ADC
P2
B
OSC
/4
up
TM4BC
Timer 4
TM4CA
TM4CAX
TM4CB
TM4CBX
TM4OA
T
Q
T
Q
R
S
S
Q
Controller
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
—
P2
MD14
P2
MD13
P2
MD12
P2
MD11
P2
MD10
P2
MD9
P2
MD8
P2
MD7
P2
MD6
P2
MD5
P2
MD4
P2
MD3
P2
MD2
P2
MD1
P2
MD0
Setting:
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0