7702 datasheet(139/217 Pages) RENESAS

139 / 217 page

7702/7703 Group User’s Manual

TIMER B

6–3

6.2 Block description

6.2.1 Counter and reload register (timer Bi register)

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

(1) Functions in timer mode and event counter mode

The counter down-counts each time count source is input. The reload register is used to store the

initial value of the counter. When the counter underflows, the reload register’s contents are reloaded

into the counter.

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

6.2.1 lists the memory assignment of the timer Bi register.

The value written into the timer Bi register when the counting is not in progress is set to the counter

and reload register. The value written into the timer Bi register when the counting is in progress is

set to only the reload register. In this case, the reload register’s updated contents are transferred to

the counter when the counter underflows next time. The counter value is read out by reading out the

timer Bi register.

Note: When reading and writing from/to the timer Bi register, perform them in an unit of 16 bits. For

more information about the value got by reading the timer Bi register, refer to “[Precautions

when operating in timer mode]” and “[Precautions when operating in event counter

mode].”

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

The counter up-counts each time 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 the TBiIN pin, the counter

value is transferred to the reload register. In this mode, the value got by reading the timer Bi register

is the reload register’s contents, so that the measurement result is obtained.

Note: When reading from the timer Bi register, perform it in an unit of 16 bits.

Timer Bi register

Timer B0 register

Timer B1 register

Timer B2 register

Low-order byte

Address 5016

Address 5216

Address 5416

High-order byte

Address 5116

Address 5316

Address 5516

Note: When reset, the contents of the timer Bi reg-

ister are undefined.

Table 6.2.1 Memory assignment of timer Bi registers

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