HT68F20 datasheet(96/210 Pages) HOLTEK

96 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev.1.00

November 3, 2009

· 16-bit Standard TM Register List - HT68F40/HT68F50/HT68F60

¨ TM2C0 Register - 16-bit STM

Bit

76543210

Name

T2PAU

T2CK2

T2CK1

T2CK0

T2ON

¾¾¾

R/W

¾¾¾

POR

00000

¾¾¾

Bit 7

T2PAU: TM2 Counter Pause Control

0: Run

1: Pause

The counter can be paused by setting this bit high. Clearing the bit to zero restores normal

counter operation. When in a Pause condition the TM will remain powered up and continue to

consume power. The counter will retain its residual value when this bit changes from low to high

and resume counting from this value when the bit changes to a low value again.

Bit 6~4

T2CK2, T2CK1, T2CK0: Select TM2 Counter clock

000: fSYS/4

001: fSYS

010: fH/16

011: fH/64

100: fTBC

101: Reserved

110: TCK2 rising edge clock

111: TCK2 falling edge clock

These three bits are used to select the clock source for the TM. Selecting the Reserved clock

input will effectively disable the internal counter. The external pin clock source can be chosen to

be active on the rising or falling edge. The clock source fSYS is the system clock, while fH and

fTBC are other internal clocks, the details of which can be found in the oscillator section.

Bit 3

T2ON: TM2 Counter On/Off Control

0: Off

1: On

This bit controls the overall on/off function of the TM. Setting the bit high enables the counter to

run, clearing the bit disables the TM. Clearing this bit to zero will stop the counter from counting

and turn off the TM which will reduce its power consumption. When the bit changes state from

low to high the internal counter value will be reset to zero, however when the bit changes from

high to low, the internal counter will retain its residual value until the bit returns high again.

If the TM is in the Compare Match Output Mode then the TM output pin will be reset to its initial

condition, as specified by the T2OC bit, when the T2ON bit changes from low to high.

Bit 2~0

Unimplemented, read as

²0²

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