M30620FCAFP datasheet(352/615 Pages) RENESAS

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Timer A

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-35

(1) To clear reset, the count start flag is set to “0”. Set a value in the timer Ai register, then set the

flag to “1”.

(2) Reading the timer Ai register while a count is in progress allows reading, with arbitrary timing,

the value of the counter. Reading the timer Ai register with the reload timing shown in Figure

2.2.29 gets “FFFF16” by underflow or “000016” by overflow. Reading the timer Ai register after

setting a value in the timer Ai register with a count halted but before the counter starts count-

ing gets a proper value.

(3) Please note the standards for the differences between the 2 pulses used in the 2-phase pulse

signals input signals to the TAiIN pin and TAiOUT pin (i = 2, 3, 4), as shown in Figure 2.2.30.

(4) When free run type is selected, if count is stopped, set a value in the timer Ai register again.

2.2.14 Precautions for Timer A (event counter mode)

Figure 2.2.30. Standard of 2-phase pulses

n – 1

Counter value

(Hex.)

FFFF

Read value

(Hex.)

Reload

Time

n = reload register content

(1) Down count

FFFD FFFE FFFF

n + 1

Counter value

(Hex.)

FFFD FFFE FFFF 0000 n + 1

Read value

(Hex.)

Reload

Time

n = reload register content

(2) Up count

n – 1

Figure 2.2.29. Reading timer Ai register

TA2OUT

TA3OUT

TA4OUT

TA2IN

TA3IN

TA4IN

(Min.)

T2, T3

(Min.)

Vcc = 5V, f(XIN) = 16MHz

800ns

200ns

(Min.)

T2, T3

(Min.)

Vcc = 3V, f(XIN) = 10MHz, one-wait

2µs

500ns

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