NT68F62 Datasheet, PDF (33/57 Pages) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (32K Flash MTP Type)

NT68F62
14. Base Timer (BT)
The BASE TIMER is an 8-bit counter, and its clock source
can be chosen from 1µs or 1ms by setting the BTCLK bit
('0' for 1µs and '1' for 1ms). The BT can be enabled or
disabled by the ENBT bit in the BTCON register. The BT
will start counting while clearing the ENBT bit to ‘0’. After
the chip is reset, the BTCLK and ENBT bits are set to '1'
(the BT is disabled). Before enabling the BT, it can be
preloaded with a value by writing a value to the BT register
(write only) at any time and then the BT will start to count
up from this preloaded value. When the BT’s value reaches
FFH, it will generate a timer interrupt if the timer interrupt is
enabled, and then the counter will wrap around to 00H. The
timer’s maximum interval is 256ms or 256µs depending on
the BTCLK value.
1us
0
1ms
1
BTCLK
BT7 BT6 BT5 BT4 BT3 BT2 BT1 BT0
INTMR INT
Control Bit Description:
Addr. Register
INIT
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
R/W
$002E
BT
00H
BT7
BT6
BT5
BT4
BT3
BT2
BT1
BT0
W
$002F BT CON
03H
―
―
―
―
―
―
BTCLK
ENBT
W
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