m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 172

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

R
R
M
e
E
3
. v
J
Table 14.7 Specifications in Pulse Width Modulation Mode
NOTES:
2
0
Count Source
Counting Operation
16-Bit PWM
8-Bit PWM
Counter Start Condition
Counter Stop Condition
Interrupt Request Generation Timing On the falling edge of the PWM pulse
TAi
TAi
Read from Timer
Write to Timer
14.1.4 Pulse Width Modulation Mode
1
9
C
3 .
B
In pulse width modulation mode, the timer outputs pulse of desired width continuously (see Table 14.7).
The counter functions as either 16-bit pulse width modulator or 8-bit pulse width modulator. Figure 14.13
shows the TAiMR register (i=0 to 4) in pulse width modulation mode. Figures 14.14 and 14.15 show
examples of how a 16-bit pulse width modulator operates and of how an 8-bit pulse width modulator
operates.
8 /
IN
OUT
0
1
1. The CNT3 to CNT0 bits in the TCSPR register select no division (n=0) or divide-by-2n (n=1 to 15).
3
0
Pin Function
3
J
G
4
a
Pin Function
0 -
n
o r
3 .
1
Item
u
, 1
3
p
1
2
(
M
0
0
3
6
2
C
Page 149
8 /
, 3
M
3
• Cycles = (2
f
The timer decrements the counter
• The timer reloads on the rising edge of PWM pulse and continues counting.
• The timer is not affected by the trigger that is generated during counting.
• "H" width = n / f
• Cycle = (2
• "H" width
• External trigger is input
• The timer overflows and underflows
• The TAiS bit in the TABSR register is set to "1" (start counting)
The TAiS bit is set to "0" (stop counting)
Programmable I/O port or trigger input
Pulse output
The value in the TAi register is indeterminate when read
• When the timer counter stops,
• While counting,
2
1
(It is transferred to the counter at the next reload timing)
, f
n : setting value of high-order bit address of the TAi register
m : setting value of low-order bit address of the TAi register
the value written to the TAi register is also written to both reload register and counter
the value written to the TAi register is written to the reload register
C
f o
8
(The counter functions as an 8-bit or a 16-bit pulse width modulator)
8 /
, f
4
3
8
2n (1)
) T
8
, f
=
16
C32
8
n x (m+1) / f
-1) / f
-1) x (m+1) / f
j
j
fixed
j
j
n : setting value of the TAi register
f
j
: Count source frequency
Specification
00
0000
00
16
14. Timer (Timer A)
16
to FE
16
to FF
to FFFE
16
16
16