NT6861U View Datasheet(PDF) - Novatek Microelectronics

Part Name

Description

Manufacturer

NT6861U

8-Bit Microcontroller for Monitor

Novatek Microelectronics 

NT6861

13. BASE TIMER (BT)

The Base Timer is an 8-bit counter whose clock source must be chosen with 1µs or 1ms by setting or clearing the TBS bit

('0' for 1µs and '1' for 1ms). The BT can be enabled/disabled by the ENBT bit in the BTCON register. When user clearing this

control bit to '0', the BT will start counting, otherwise setting this bit to '1' will stop the counting. After chip is reset, the TBS and

ENBT bits are set to '1' (the BT is disabled). BT, can be preset by writing BT7 - BT0 to the BT register (write only) at any time

and the BT will start count-up from preset value. When the value reaches FFH, it generates a timer interrupt if the timer

interrupt is enabled. When it reaches the maximum value of FFH, the base timer will wrap around and begin counting at 00H.

The timer interval can be within 256 ms maximum if set TBS to '1'. The timer interval can be within 256µs maximum if set TBS

to '0'.

1µs

1ms

0

1

TBS

BT7 BT6 BT5 BT4 BT3 BT2 BT1 BT0

TMR INT

Control bit description:

Addr. Register INIT

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

$0016

BT

00H

BT7

BT6

BT5

BT4

BT3

BT2

BT1

BT0

W

$0017 BT CON 03H

-

-

-

-

-

-

TBS

ENBT W

BT control register :

BT0 - BT7: Preloaded value of the base timer. The timer will count-up from this value.

BTCON control register:

ENBT : When clearing this bit, the base timer will be activated.

TBS: Select the input clock source of base timer - '1' for 1ms and '0' for 1µs.

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