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| 型號(hào)： | 73S1217F-68MR/F/PE |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 80/140頁(yè) |
| 文件大小： | 0K |
| 描述： | IC SOC SMART CARD READER 68QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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73S1217F Data Sheet
DS_1217F_002
Miscellaneous Control Register 0 (MISCtl0): 0xFFF1
0x00
Transmit and receive (TX and RX) pin selection and loop back test configuration are set up via this register.
Table 37: The MISCtl0 Register
MSB
LSB
PWRDN
–
SLPBK
SSEL
Bit
Symbol
Function
MISCtl0.7
PWRDN
This bit places the 73S1217F into a power down state.
MISCtl0.6
–
MISCtl0.5
–
MISCtl0.4
–
MISCtl0.3
–
MISCtl0.2
–
MISCtl0.1
SLPBK
1 = UART loop back testing mode. The pins TXD and RXD are to be
connected together externally (with SLPBK =1) and therefore:
SLPBK SSEL
Mode
0
normal using Serial_0
0
1
normal using Serial_1
1
0
Serial_0 TX feeds Serial_1 RX
1
Serial_1 TX feeds Serial_0 RX
MISCtl0.0
SSEL
Selects either Serial_1 if set =1 or Serial_0 if set = 0 to be connected to
RXD and TXD pins.
1.7.6.1
Serial Interface 0
The Serial Interface 0 can operate in four modes:
Mode 0
Pin RX serves as input and output. TX outputs the shift clock. Eight bits are transmitted with the LSB
first. The baud rate is fixed at 1/12 of the crystal frequency. Reception is initialized in Mode 0 by setting
the flags in S0CON as follows: RI0 = 0 and REN0 = 1. In other modes, a start bit when REN0 = 1 starts
receiving serial data.
Mode 1
Pin RX serves as input, and TX serves as serial output. No external shift clock is used, 10 bits are
transmitted: a start bit (always 0), 8 data bits (LSB first), and a stop bit (always 1). On receive, a start bit
synchronizes the transmission, 8 data bits are available by reading S0BUF, and stop bit sets the flag
RB80 in the Special Function Register S0CON. In mode 1 either internal baud rate generator or timer 1
can be use to specify baud rate.
Mode 2
This mode is similar to Mode 1, with two differences. The baud rate is fixed at 1/32 or 1/64 of oscillator
frequency and 11 bits are transmitted or received: a start bit (0), 8 data bits (LSB first), a programmable
9th bit, and a stop bit (1). The 9th bit can be used to control the parity of the serial interface: at
transmission, bit TB80 in S0CON is output as the 9th bit, and at receive, the 9th bit affects RB80 in
Special Function Register S0CON.
Mode 3
The only difference between Mode 2 and Mode 3 is that in Mode 3 either internal baud rate generator or
timer 1 can be use to specify baud rate.
The S0BUF register is used to read/write data to/from the serial 0 interface.
Serial Interface 0 Control Register (S0CON): 0x9B
0x00
44
Rev. 1.2
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