參數(shù)資料
型號(hào)： PONE-000-01
廠商： Electronic Theatre Controls, Inc.
英文描述： The ideal device for simple nodes, such as switches, actuators and sensor
中文描述： 在簡(jiǎn)單的節(jié)點(diǎn)，如交換機(jī)，執(zhí)行器和傳感器的理想設(shè)備
文件頁(yè)數(shù)： 41/56頁(yè)
文件大?。?/td> 432K
代理商： PONE-000-01
March 2000
CEWay
PL-One Data Sheet
D-CW-0100-04
Page 41 of 56
SCON.0
RI. Receive interrupt flag. This is set by hardware at the end of the 8th bit in mode 0, or at the
half point of the stop bit in other modes. Must be cleared by software. The mode control bits operate as
follows:
SM0
0
0
1
1
SM1
0
1
0
1
Operating Mode
Mode 0: 8-bit shift register
Mode 1: 8-bit UART
Mode 2: 9-bit UART
Mode 3: 9-bit UART
Baud Rate
f
osc
/12
Variable
f
osc
/32 or f
osc
/64
Variable
Table 12 UART Mode Bits (SCON.7, SCON.6) for Serial Port
SM2 modifies the above as follows: In modes 2 & 3, if SM2 is set, the receive interrupt will not be
generated if the received 9th data bit is 0. In mode 1, the receive interrupt will not be generated if a valid
stop bit is not received. In mode 0, SM2 should be 0. This bit enables multi-processor communication
over a single serial line.
UART Baud Rates
The UART baud rates in each of the 4 modes are defined as follows:
Mode 0.
The baud rate is fixed:
Baud Rate = f
osc
/ 12.
Modes 1 and 3.
The baud rate is variable, determined by timer/counter 1 or timer/counter 2 (timer/counter
1 should be in auto-reload mode, timer/counter 2 should be in baud rate generating mode):
Baud Rate = K × f
osc
/ 32 × 12 × (256 - TH1)
Mode 2.
The baud rate is selectable from one of two values:
Baud Rate = K × f
osc
/ 64
K = PCON.7 + 1.
TH1 is the auto-reload value for timer/counter 1.
It should be noted that in modes 1 and 3 the equation is valid for all values of TH1.
If Timer 2 is being clocked internally, then:
Timer 2 Baud Rate = fosc / 32 × ( 65536 - (RCAP2H.RCAP2L) )
The above equation is valid for all values of RCAP2 except 65535 (FFFFh).
If Timer 2 is being clocked internally, then:
Timer 2 Baud Rate = Timer 2 Overflow Rate / 16
The above equation is valid for all values of RCAP2.
UART Data (SBUF)
This register is used for both transmit and receive data. Transmit data is written to this location and
receive data is read from this location, but the two paths are independent. On reset SCON returns 00 hex,
SBUF returns XX hex.
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