Renesas Single-Chip Microcomputer M37531T-ADS Informacje Techniczne Pobierz pdf (Strona 13)

Timer A

Mitsubishi microcomputer

M16C / 62A Grou

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTE

2-3

(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

210

n – 1

Counter value

(Hex.)

210

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

T2 T3

TA2

OUT

TA3

OUT

TA4

OUT

TA2

TA3

TA4

(Min.)

T2, T3

(Min.)

Vcc = 5V, f(X

) = 16MHz

800ns 200ns

(Min.)

T2, T3

(Min.)

Vcc = 3V, f(X

) = 10MHz, one-wai

2µs 500ns

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 56 57

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