HT68F03 datasheet(79/139 Pages) HOLTEK

79 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

¨ TM2C2 Register

Bit

76543210

Name

T2BM1

T2BM0

T2BIO1

T2BIO0

T2BOC

T2BPOL

T2PWM1

T2PWM0

R/W

POR

00000000

Bit 7~6

T2BM1~T2BM0: Select TM2 CCRB 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 T2BM1 and T2BM0 bits. In the

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

Bit 5~4

T2BIO1~T2BIO0: Select TP2B 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 TP2B

01: Input capture at falling edge of TP2B

10: Input capture at falling/rising edge of TP2B

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 T2BIO1 and T2BIO0 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 T2BOC bit in the

TM2C2 register. Note that the output level requested by the T2BIO1 and T2BIO0 bits must be

different from the initial value setup using the T2BOC 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

T2BOC: TP2B 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.

HT68F03 Datenblatt(PDF) 79 Page - Holtek Semiconductor Inc

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