7733 datasheet(115/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–4

Timer Ai register

High-order byte

Low-order byte

Timer A0 register

Address 4716

Address 4616

Timer A1 register

Address 4916

Address 4816

Timer A2 register

Address 4B16

Address 4A16

Timer A3 register

Address 4D16

Address 4C16

Timer A4 register

Address 4F16

Address 4E16

6.2.1 Counter and reload register (Timer Ai register)

Each of timer Ai counter and its reload register consists of 16 bits.

The counter performs countdown each time a count source is input. In the event counter mode, it can also

function as an up-counter.

The reload register is used to memorize the initial value of a counter. When an underflow/overflow occurs

in the counter, the reload register’s contents is reloaded into the counter. However, when the free-run count

function is used, the reload register’s contents is not reloaded into the counter.

Values are set to the counter and reload register by writing the values to the timer Ai register. Table 6.2.1

lists the memory allocation of the timer Ai register.

A value written into the timer Ai register while counting is stopped is set to the counter and reload register.

A value written into the timer Ai register while counting is in progress is set only to the reload register. In

this case, the reload register’s updated contents is transferred to the counter at the next reload time. A

value obtained by reading out the timer Ai register depends on the operating mode. Table 6.2.2 lists

reading and writing from and to the timer Ai register.

Table 6.2.1 Memory allocation of timer Ai register

Table 6.2.2 Reading and writing from and to timer Ai register

Write

Written only to the reload register.

Written to both of the counter and

reload register.

6.2 Block description

Note: At reset, the contents of the timer Ai register is undefined.

Operating mode

Timer mode

Event counter mode

One-shot pulse mode

Pulse width modulation (PWM) mode

Read

Counter value is read out.

(Note 1)

Undefined value is read out.

Notes 1: Also refer to “Precautions in timer mode” and “Precautions in event counter mode.”

2: Perform reading or writing by the 16 bits.

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