TIMER A
7.1 Overview
7.1 Overview
Timer A consists of ten counters, Timers A0 to A9, each equipped with a 16-bit reload function. Timers A0
to A9 operate independently of one other.
Timer Ai (i = 0 to 9) has four operating modes listed below. Except for the event counter mode, timer Ai
has the same functions.
Table 7.1.1 lists the functions of timer Ai.
(1) Timer mode
In this mode, the timer counts an internally generated count source. Following functions can be used
in this mode:
• Gate function
• Pulse output function
(2) Event counter mode
In this mode, the timer counts an external signal. Following functions can be used in this mode:
• Pulse output function
• Two-phase pulse signal processing function (Timers A2 to A4, A7 to A9)
(3) One-shot pulse mode
In this mode, the timer outputs a pulse which has an arbitrary width once.
(4) Pulse width modulation (PWM) mode
In this mode, the timer outputs pulses which have an arbitrary width in succession. In this mode, the
timer serves as one of the following pulse width modulators:
• 16-bit pulse width modulator
• 8-bit pulse width modulator
Table 7.1.1 Functions of timer Ai
Timer Ai (i = 0 to 9)
Functions of timers
TA2 TA3 TA4 TA5
TA0
TA1
TA6 TA7 TA8 TA9
Timer mode
Timer
Gate function
Pulse output function
Pulse output function
Two-phase pulse signal processing function
Event counter mode
One-shot pulse mode
(Note)
—
—
(Note)
Pulse width modulation (PWM) mode
Note: Normal processing for TA2, TA3, TA7, TA8; and quadruple processing for TA4, TA9
7905 Group User’s Manual Rev.1.0
7-2
RENESAS [ RENESAS TECHNOLOGY CORP ]
