HT68F20 datasheet(97/210 Pages) HOLTEK

97 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

November 3, 2009

¨ TM2C1 Register - 16-bit STM

Bit

76543210

Name

T2M1

T2M0

T2IO1

T2IO0

T2OC

T2POL

T2DPX

T2CCLR

R/W

POR

00000000

Bit 7~6

T2M1~T2M0: Select TM2 Operating Mode

00: Compare Match Output Mode

01: Capture Input Mode

10: PWM Mode or Single Pulse Output Mode

11: Timer/Counter Mode

These bits setup the required operating mode for the TM. To ensure reliable operation the TM

should be switched off before any changes are made to the T2M1 and T2M0 bits. In the

Timer/Counter Mode, the TM output pin control must be disabled.

Bit 5~4

T2IO1~T2IO0: Select TP2_0, TP2_1 output function

Compare Match Output Mode

00: No change

01: Output low

10: Output high

11: Toggle output

PWM Mode/ Single Pulse Output Mode

00: Force inactive state

01: Force active state

10: PWM output

11: Single pulse output

Capture Input Mode

00: Input capture at rising edge of TP2_0, TP2_1

01: Input capture at falling edge of TP2_0, TP2_1

10: Input capture at falling/rising edge of TP2_0, TP2_1

11: Input capture disabled

Timer/counter Mode:

Unused

These two bits are used to determine how the TM output pin changes state when a certain

condition is reached. The function that these bits select depends upon in which mode the TM

is running.

In the Compare Match Output Mode, the T2IO1 and T2IO0 bits determine how the TM output

pin changes state when a compare match occurs from the Comparator A. The TM output pin can

be setup to switch high, switch low or to toggle its present state when a compare match occurs

from the Comparator A. When the bits are both zero, then no change will take place on the

output. The initial value of the TM output pin should be setup using the T2OC bit in the TM2C1

the initial value setup using the T2OC bit otherwise no change will occur on the TM output pin

when a compare match occurs. After the TM output pin changes state it can be reset to its initial

level by changing the level of the T2ON bit from low to high.

Bit 3

T2OC: TP2_0, TP2_1 Output control bit

Compare Match Output Mode

0: Initial low

1: Initial high

PWM Mode/ Single Pulse Output Mode

0: Active low

1: Active high

This is the output control bit for the TM output pin. Its operation depends upon whether TM is

being used in the Compare Match Output Mode or in the PWM Mode/ Single Pulse Output Mode.

It has no effect if the TM is in the Timer/Counter Mode. In the Compare Match Output Mode it

determines the logic level of the TM output pin before a compare match occurs. In the PWM

Mode it determines if the PWM signal is active high or active low.

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