參數(shù)資料
型號(hào)： NRF9E5-EVKIT868
廠商： Electronic Theatre Controls, Inc.
英文描述： 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC
中文描述： 433/868/915MHz RF收發(fā)器與8051兼容的嵌入式微控制器和4輸入，10位ADC
文件頁(yè)數(shù)： 84/104頁(yè)
文件大?。?/td> 1436K
代理商： NRF9E5-EVKIT868
PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone +4772898900 - Fax +4772898989
Revision: 1.1
Page 84 of 104
June 2004
18.9.2
Mode 1
Mode 1 provides standard asynchronous, full-duplex communication, using a total of ten
bits: one start bit, eight data bits, and one stop bit. For receive operations, the stop bit is
stored in RB8. Data bits are received and transmitted LSB first.
18.9.2.1
Mode 1 Baud Rate
The mode 1 baud rate is a function of timer overflow. Serial port can use either Timer 1
or Timer 2 to generate baud rates. Each time the timer increments from its maximum
count (0xFF for Timer 1 or 0xFFFF for Timer 2), a clock is sent to the baud-rate circuit.
The clock is then divided by 16 to generate the baud rate. When using Timer 1, the
SMOD bit selects whether or not to divide the Timer 1 rollover rate by 2. Therefore,
when using Timer 1, the baud rate is determinedby the equation:
Baud Rate =
32
2
SMOD
x Timer 1 Overflow
SMOD is SFR bit PCON.7
When using Timer 2, the baud rate is determined by the equation:
Baud Rate =
16
Overflow
Timer
To use Timer 1 as the baud-rate generator, it is best to use Timer 1 mode 2 (8-bit counter
with auto-reload), although any counter mode can be used. The Timer 1 reload value is
stored in the TH1 register, which makes the complete formula for Timer 1:
Baud Rate =
32
2
SMOD
x
TH1)
-
(256
x
4
clk
The 4 in the denominator in the above equation can be obtained by setting the T1M bit
in the CKCON SFR. To derive the required TH1 value from a known baud rate (when
TM1 = 0), use the equation:
TH1 = 256 -
Rate
Baud
128
2
clk
SMOD
You can also achieve very low serial port baud rates from Timer 1 by enabling the
Timer 1 interrupt, configuring Timer 1 to mode 1, and using the Timer 1 interrupt to
initiate a 16-bit software reload. Table Table 72 lists sample reload values for a variety
of common serial port baud rates.
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NRF9E5-EVKIT915 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC
NRF9E5IC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC
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