M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 120

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M
R
R
12.1 Timer A
1
e
E
Figure 12.3 Timer A Block Diagram
Figure 12.4 TA0MR to TA4MR Registers
6
. v
J
Figure 12.3 shows a block diagram of the timer A. Figures 12.4 to 12.6 show registers related to the timer A.
The timer A supports the following four modes. Except in event counter mode, timers A0 to A4 all have the
same function. Use the TMOD1 to TMOD0 bits in the TAiMR register (i = 0 to 4) to select the desired mode.
0
C
2
9
• Timer mode: The timer counts an internal count source.
• Event counter mode: The timer counts pulses from an external device or overflows and underflows of
• One-shot timer mode: The timer outputs a pulse only once before it reaches the minimum count “0000
• Pulse width modulation (PWM) mode: The timer outputs pulses in a given width successively.
2 /
0 .
B
other timers.
8
0
0
TAk overflow
(k = i + 1. however, k = 0 when i = 4)
0
TB2 overflow
TAj overflow
(j = i – 1. however, j = 4 when i = 0)
Timer Ai Mode Register (i=0 to 4)
f
G
1
b7
TAi
(i = 0 to 4)
4
TAi
(i = 0 to 4)
J
NOTES:
f
or f
7
o r
a
f
C32
f
8
32
IN
0 -
. n
b6
OUT
1. Overflow or underflow
u
2
2
p
3
Clock source
selection
selection
b5
0
Polarity
, 1
0
(
M
(1)
(1)
b4
2
1
0
6
0
b3
7
C
Pulse output
2 /
b2
, 8
page 100
b1
Clock selection
M
b0
1
• Timer
• One shot
• PWM
• Timer
• Event counter
(gate function)
6
Bit Symbol
C
TMOD0
TCK0
TCK1
TMOD1
MR0
MR1
MR2
MR3
2 /
f o
Symbol
TA0MR to TA4MR
8
3
) B
8
5
To external
trigger circuit
Count source select bit
Operation mode select bit
Clock selection
UDF register
Bit Name
TABSR register
Decrement
Toggle flip-flop
Address
0396
16
Data bus high-order bits
Data bus low-order bits
to 039A
Reload register
b1 b0
0 0 : Timer mode
0 1 : Event counter mode
1 0 : One-shot timer mode
1 1 : Pulse width modulation
Function varies with each
operation mode
Function varies with each
operation mode
Low-order
8 bits
Counter
16
(PWM) mode
Timer A0 0387
Timer A1 0389
Timer A2 038B
Timer A3 038D
Timer A4 038F
TAi
After Reset
00
Increment/decrement
16
Always counts down except
in event counter mode
Function
Addresses
16
16
16
16
16
- 0386
- 0388
- 038A
- 038E
- 038C
High-order
8 bits
16
16
16
16
16
Timer A4
Timer A0
Timer A1
Timer A2
Timer A3
TAj
RW
RW
RW
RW
RW
RW
RW
RW
RW
Timer A1
Timer A2
Timer A3
Timer A4
Timer A0
TAk
12. Timer
16
”.