参数资料
型号: SAF-C501G-1EP
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 14/48页
文件大小: 319K
代理商: SAF-C501G-1EP
Semiconductor Group
21
1997-04-01
C501
Serial Interface (USART)
The serial port is full duplex and can operate in four modes (one synchronous mode, three
asynchronous modes) as illustrated in table 6. The possible baudrates can be calculated using the
formulas given in table 7.
Table 6
USART Operating Modes
Mode
SCON
Baudrate
Description
SM0
SM1
00
0
f
OSC/12
Serial data enters and exits through R
×D.
T
×D outputs the shift clock. 8-bit are
transmitted/received (LSB first)
1
0
1
Timer 1/2 overflow rate
8-bit UART
10 bits are transmitted (through T
×D) or
received (R
×D)
21
0
f
OSC/32 or fOSC/64
9-bit UART
11 bits are transmitted (T
×D) or
received (R
×D)
3
1
Timer 1/2 overflow rate
9-bit UART
Like mode 2 except the variable baud rate
Table 7
Formulas for Calculating Baudrates
Baud Rate
derived from
Interface Mode
Baudrate
Oscillator
0
2
f
OSC/12
(2SMOD
× f
OSC) / 64
Timer 1 (16-bit timer)
(8-bit timer with
8-bit autoreload)
1,3
(2SMOD
× timer 1 overflow rate) /32
(2SMOD
× f
OSC) / (32 × 12 × (256-TH1))
Timer 2
1,3
f
OSC / (32 × (65536-(RC2H, RC2L))
相关PDF资料
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