Timer 3 Counting Registers; Timer 4 Counting Registers; Timer 3 8-Bit Prescaler Register (Tm3Ps) - STC micro STC8A8K64D4 Series Reference Manual

STC8A8K64D4 Series Manual

0: T4 stops counting.

1: T4 start counting.

T4_C/T: T4 mode select bit.

0: T4 is used as a timer (input pulse is from internal system clock);

1: T4 is used as a counter (input pulse is from external T4/P0.6 pin).

T4x12: T4 speed control bit.

0: The clock source of T4 is SYSclk/12.

1: The clock source of T4 is SYSclk/1.

T4CLKO: T4 clock out control bit.

0: Turn off the clock output.

1: P0.7 is configured for T4 clock output pin. When T4 overflows, P0.7 will flip automatically.

TR3: T3 run control bit.

0: T3 stops counting.

1: T3 start counting.

T3_C/T: T3 mode select bit.

0: T3 is used as a timer (input pulse is from internal system clock);

1: T3 is used as a counter (input pulse is from external T3/P0.4 pin).

T3x12: T3 speed control bit.

0: The clock source of T3 is SYSclk/12.

1: The clock source of T3 is SYSclk/1.

T3CLKO: T3 clock out control bit.

0: Turn off the clock output.

1: P0.5 is configured for T3 clock output pin. When T3 overflows, P0.5 will flip automatically.

13.4.2 Timer 3 Counting Registers

T3 operates in 16-bit auto-reload mode. T3L and T3H combine into a 16-bit register with T3L as the low byte and

T3H as the high byte. When the 16-bit counter [T3H, T3L] overflows, the system loads the reload value in the

internal 16-bit reload register into [T3H, T3L] automatically.

T4 operates in 16-bit auto-reload mode. T4L and T4H combine into a 16-bit register with T4L as the low byte and

T4H as the high byte. When the 16-bit counter [T4H, T4L] overflows, the system loads the reload value in the

internal 16-bit reload register into [T4H, T4L] automatically.

Timer 3 clock = SYSclk ÷ ( TM3PS + 1 )

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