Rev.1.00
May 18, 2004
page 90 of 296
M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP
Item
Specification
Count source
f1, f8, f32, fC32
Count operation
The timer counts down (operating as an 8-bit or a 16-bit pulse width modulator)
The timer reloads a new count at a rising edge of PWM pulse and continues counting
The timer is not affected by a trigger that occurs when counting
16-bit PWM
High level width n / fi
n : Set value
Cycle time
(216-1) / fi fixed
8-bit PWM
High level width n (m+1) / fi n : values set to timer Ai register’s high-order address
Cycle time
(28-1) (m+1) / fi
m : values set to timer Ai register’s low-order address
Count start condition
The timer overflows
The count start flag is set (= 1)
Count stop condition
The count start flag is reset (= 0)
Interrupt request generation timing
PWM pulse goes “L”
TA2OUT/TA3OUT pin function Pulse output
Read from timer
When timer Ai register is read, it indicates an indeterminate value
Write to timer
When counting stopped
When a value is written to timer Ai register, it is written to both reload register and
counter
When counting in progress
When a value is written to timer Ai register, it is written to only reload register
(Transferred to counter at next reload time)
(4) Pulse width modulation (PWM) mode
In this mode, the timer outputs pulses of a given width in succession. (See Table 2.10.4.) In this mode, the
counter functions as either a 16-bit pulse width modulator or an 8-bit pulse width modulator. Figure 2.10.14
shows the timer Ai mode register in pulse width modulation mode. Figure 2.10.15 shows the example of how
an 8-bit pulse width modulator operates.
Table 2.10.4 Timer specifications in pulse width modulation mode
Figure 2.10.14 Timer Ai mode register in pulse width modulation mode (i = 2 and 3)
Bit name
Timer Ai mode register
Symbol
Address
When reset
TAiMR(i=2 and 3)
039816 and 039916
0016
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
Operation mode
select bit
1 1 : PWM mode
b1 b0
TMOD1
TMOD0
MR0
Reserved bits
MR3
0 0 : f1
0 1 : f8
1 0 : f32
1 1 : fC32
b7 b6
TCK1
TCK0
Count source select bit
W
R
11
1
1 (Must always be “1” in PWM mode)
16/8-bit PWM mode
select bit
0: Functions as a 16-bit pulse width modulator
1: Functions as an 8-bit pulse width modulator
Must always be set to “0”
0
MR2
Trigger select bit
0: Count start flag is valid
1: Selected by event/trigger select register