參數(shù)資料
型號: NT68F62U
廠商: Electronic Theatre Controls, Inc.
英文描述: 8-Bit Microcontroller for Monitor (32K Flash MTP Type)
中文描述: 8位微控制器的監(jiān)視器(32K閃存中期型)
文件頁數(shù): 33/57頁
文件大小: 521K
代理商: NT68F62U
NT68F62
33
14. Base Timer (BT)
The BASE TIMER is an 8-bit counter, and its clock source
can be chosen from 1
μ
s or 1ms by setting the BTCLK bit
('0' for 1
μ
s 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
1us
0
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 256
μ
s depending on
the BTCLK value.
BT7
INTMR INT
1ms
BTCLK
1
BT6
BT5
BT4
BT3
BT2
BT1
BT0
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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