7702 datasheet(127/217 Pages) RENESAS

127 / 217 page

TIMER A

7702/7703 Group User’s Manual

5–39

5.6 Pulse width modulation (PWM) mode

In this mode, the timer continuously outputs pulses which have an arbitrary width. (Refer to Table 5.6.1.)

Figure 5.6.1 shows the structures of the timer Ai mode register and timer Ai register in the PWM mode.

Table 5.6.1 Specifications of PWM mode

Item

Count source

Count operation

PMW period/“H” level width

Count start condition

Count stop condition

Interrupt request occurrence timing

TAiIN pin function

TAiOUT pin function

Read from timer Ai register

Write to timer Ai register

Specifications

f2, f16, f64, or f512

q Down-count (operating as an 8-bit or 16-bit pulse width modulator)

q Reload register’s contents are reloaded at rising of PWM pulse and

counting continues.

q A trigger generated during counting does not affect the counting.

<16-bit pulse width modulator>

“H” level width =

[s]

n: Timer Ai register setting value

<8-bit pulse width modulator>

“H” level width =

[s]

m: Timer Ai register low-order 8 bits setting value

n: Timer Ai register high-order 8 bits setting value

q When a trigger is generated. (Note)

q Internal or external trigger can be selected by software.

When count start bit is cleared to “0.”

At falling of PWM pulse

Programmable I/O port or trigger input

PWM pulse output

An undefined value is read out.

q While counting is stopped

When a value is written to timer Ai register, it is written to both

reload register and counter.

q While counting is 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.)

Period =

[s]

(216 – 1)

Period =

[s]

(m + 1)(28 – 1)

n(m + 1)

Note: The trigger is generated with the count start bit = “1.”

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