M30218 Datasheet, PDF (81/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Timer A
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Condition : Reload register = 000316, when external trigger
(falling edge of TA0IN pin's input signal) is selected.
1 / fi X (2¹⁶ –1)
Count source
TA0IN pin's
“H”
input signal
“L”
PWM pulse output ^{“H”}
from TA0OUT pin _{“L”}
Timer A0 interrupt “1”
request bit
“0”
Trigger is not generated by this signal
1 / fi X n
fi : Frequency of count source
(f1, f8, f32, fC32)
Cleared to “0” by software, or when interrupt request is accepted.
Note: n = 000016 to FFFE16.
Figure FB-11. Example of how a 16-bit pulse width modulator operates
Condition : Reload register's high-order 8 bits = 0216
Reload register's low-order bits 8 = 0216
When external trigger (falling edge of TA0IN pin's input signal) is selected.
1 / fi X (m + 1) X (2⁸ – 1)
Count source
(Note 1)
TA0IN pin's input
“H”
signal
“L”
Underflow signal of ^{“H”}
8-bit prescaler (Note 2)_{“L”}
PWM pulse output “H”
from TA0OUT pin
“L”
Timer A0 interrupt “1”
request bit
“0”
1 / fi X (m + 1)
1 / fi X (m + 1) X n
fi : Frequency of count source
(f1, f8, f32, fC32)
Cleared to “0” by software, or when interrupt request is accepted.
Note 1: The 8-bit prescaler counts the count source.
Note 2: The 8-bit pulse width modulator counts the 8-bit prescaler's underflow signal.
Note 3: m = 0016 to FE16; n = 0016 to FE16.
Figure FB-12. Example of how an 8-bit pulse width modulator operates
80