參數(shù)資料
型號(hào)： NT68P61A
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-Bit Microcontroller for Monitor (24K OTP ROM Type)
中文描述： 8位微控制器的監(jiān)視器（足金檢察官辦公室光盤(pán)形式）
文件頁(yè)數(shù)： 34/48頁(yè)
文件大?。?/td> 1057K
代理商： NT68P61A
NT68P61A
34
polarity at the HALFHO output pin - '1' for
positive polarity and '0' for negative polarity
.
14. BASE TIMER (BT)
The Base Timer is an 8-bit counter whose clock source must be chosen with 1
μ
s or 1ms by setting or clearing the TBS bit
('0' for 1
μ
s 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
256
μ
s maximum if set TBS to '0'.
BT7
TMR INT
1
μ
s
1ms
TBS
1
0
BT6
BT5
BT4
BT3
BT2
BT1
BT0
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 1
μ
s.
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