7733 datasheet(167/940 Pages) RENESAS

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TIMER B

7733 Group User’s Manual

7–4

7.2.1 Counter and Reload register (Timer Bi register)

Each of timer Bi counter and its reload register consists of 16 bits and has the following functions.

(1) Functions in timer mode, event counter mode, and clock timer

The counter performs countdown each time a count source is input. The reload register is used to

memorize the initial value of a counter. When an underflow occurs in the counter, the reload register’s

contents is reloaded into the counter.

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

7.2.1 lists the memory allocation of the timer Bi register.

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

underflow occurs. A value obtained by reading out the timer Bi register is the counter value.

Note: Perform reading or writing from/to the timer Bi register by the 16 bits. For a value read from

the timer Bi register, refer to “Precautions in timer mode” and “Precautions in event counter

mode.”

(2) Functions in pulse period/pulse width measurement mode

The counter performs countup each time a count source is input. The reload register is used to hold

the pulse period or pulse width measurement result. When a valid edge is input to pin TBiIN, the

counter value is transferred to the reload register. In this mode, a value obtained by reading out the

timer Bi register is the reload register’s contents, and the measurement result can be obtained.

Note: Perform reading from the timer Bi register by the 16 bits.

Low-order byte

Address 5016

Address 5216

Address 5416

High-order byte

Address 5116

Address 5316

Address 5516

Timer Bi register

Timer B0 register

Timer B1 register

Timer B2 register

Note: At reset, the contents of the timer Bi register is

undefined.

Table 7.2.1 Memory allocation of timer Bi register

7.2 Block description

7733 Datasheet(PDF) 167 Page - Renesas Technology Corp