HT68F20 datasheet(83/210 Pages) HOLTEK

83 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

November 3, 2009

Compact TM Operation

At its core is a 10-bit count-up counter which is driven by

a user selectable internal or external clock source.

There are also two internal comparators with the names,

Comparator A and Comparator P. These comparators

will compare the value in the counter with CCRP and

CCRA registers. The CCRP is three bits wide whose

value is compared with the highest three bits in the

counter while the CCRA is the ten bits and therefore

compares with all counter bits.

The only way of changing the value of the 10-bit counter

using the application program, is to clear the counter by

changing the TnON bit from low to high. The counter will

also be cleared automatically by a counter overflow or a

compare match with one of its associated comparators.

When these conditions occur, a TM interrupt signal will

also usually be generated. The Compact Type TM can

operate in a number of different operational modes, can

be driven by different clock sources including an input

pin and can also control an output pin. All operating

setup conditions are selected using relevant internal

registers.

Compact Type TM Register Description

Overall operation of the Compact TM is controlled using

six registers. A read only register pair exists to store the

internal counter 10-bit value, while a read/write register

pair exists to store the internal 10-bit CCRA value. The

remaining two registers are control registers which

setup the different operating and control modes as well

as the three CCRP bits.

Name

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

TM0C0

T0PAU

T0CK2

T0CK1

T0CK0

T0ON

T0RP2

T0RP1

T0RP0

TM0C1

T0M1

T0M0

T0IO1

T0IO0

T0OC

T0POL

T0DPX

T0CCLR

TM0DL

TM0DH

¾¾¾¾¾¾

TM0AL

TM0AH

¾¾¾¾¾¾

Compact TM Register List (if CTM is TM0)

· TM0DL Register

Bit

76543210

Name

R/W

RRRRRRRR

POR

00000000

Bit 7~0

TM0DL: TM0 Counter Low Byte Register bit 7 ~ bit 0

TM0 10-bit Counter bit 7 ~ bit 0

· TM0DH Register

Bit

76543210

Name

¾¾¾¾¾¾

R/W

¾¾¾¾¾¾

POR

¾¾¾¾¾¾

Bit 7~2

Unimplemented, read as

²0²

Bit 1~0

TM0DH: TM0 Counter High Byte Register bit 1 ~ bit 0

TM0 10-bit Counter bit 9 ~ bit 8

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