参数资料
型号: ST16C654IQ64/TR
厂商: EXAR CORP
元件分类: 微控制器/微处理器
英文描述: 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQFP64
封装: 10 X 10 MM, 1.40 MM HEIGHT, LQFP-64
文件页数: 15/54页
文件大小: 734K
代理商: ST16C654IQ64/TR
xr
ST16C654/654D
REV. 5.0.2
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
19
2.15
Infrared Mode
The 654 UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data Association)
version 1.0. The IrDA 1.0 standard that stipulates the infrared encoder sends out a 3/16 of a bit wide HIGH-
pulse for each “0” bit in the transmit data stream. This signal encoding reduces the on-time of the infrared LED,
hence reduces the power consumption. See Figure 12 below.
The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. When the infrared feature
is enabled, the transmit data output, TX, idles at logic zero level. Likewise, the RX input assumes an idle level
of logic zero from a reset and power up, see Figure 12.
Typically, the wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin.
Each time it senses a light pulse, it returns a logic 1 to the data bit stream.
FIGURE 12. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
Character
Data Bits
Start
Stop
00
0
11
1 1
1
Bit Time
1/16 Clock Delay
IRdecoder-
RX Data
Receive
IR Pulse
(RX pin)
Character
Data Bits
Sta
rt
Stop
00
0
11
1
TX Data
Transmit
IR Pulse
(TX Pin)
Bit Time
1/2 Bit Time
3/16 Bit Time
IrEncoder-1
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