參數(shù)資料
型號(hào)： MC68HC2681P
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 15/88頁(yè)
文件大?。?/td> 726K
代理商： MC68HC2681P
Signal Descriptions
MOTOROLA
MC68HC681 USER’S MANUAL
2-5
2
2.14.2 IP1
This input can be used as the channel B clear-to-send active-low input (CTSB). A change-of-
state detector is also associated with this input.
2.14.3 IP2
This input can be used as the channel B receiver external clock input (RxCB), or the
counter/timer external clock input. When this input functions as the external clock to the
receiver, the received data is sampled on the rising edge of the clock. A change-of-state
detector is also associated with this input.
2.14.4 IP3
This input can serve as the channel A transmitter external clock input (TxCA). When this
input functions as the external clock to the transmitter, the transmitted data is clocked on the
falling edge of the clock. A change-of-state detector is also associated with this input.
2.14.5 IP4
This input can be used as the channel A receiver external clock input (RxCA). When this
input functions as the external clock to the receiver, the received data is sampled on the
rising edge of the clock.
2.14.6 IP5
This input can serve as the channel B transmitter external clock (TxCB). When this input is
used as the external clock to the transmitter, the transmitted data is clocked on the falling
edge of the clock.
2.15 PARALLEL OUTPUTS (OP0–OP7)
The parallel outputs can be used as general-purpose outputs; however, each pin also has
an alternate function(s), described below.
2.15.1 OP0
This output can function as the channel A transmitter active-low request-to-send (RTSA)
output, or as the channel A receiver active-low ready-to-receive (RTRA) output. When used
for RTSA, it is automatically negated by the transmitter. When used for RTRA, the receiver
automatically negates and reasserts OP0.
2.15.2 OP1
This output can serve as the channel B transmitter active-low request-to-send (RTSB)
output, or as the channel B receiver active-low ready-to-receive (RTRB) output. When used
for RTSB, the transmitter automatically negates OP1 by the transmitter. When used for
RTRB, the receiver automatically negates and reasserts OP1.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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