73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 44
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73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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Miscellaneous Control Register 0 (MISCtl0): 0xFFF1
Transmit and receive (TX and RX) pin selection and loop back test configuration are set up via this register.
1.7.6.1
The Serial Interface 0 can operate in four modes:
•
•
•
•
The
Serial Interface 0 Control Register (S0CON): 0x9B
44
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
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
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.
S0BUF
MISCtl0.7
MISCtl0.6
MISCtl0.5
MISCtl0.4
MISCtl0.3
MISCtl0.2
MISCtl0.1
MISCtl0.0
Bit
Serial Interface 0
MSB
register is used to read/write data to/from the serial 0 interface.
PWRDN
S0CON
PWRDN
Symbol
SLPBK
SSEL
as follows: RI0 = 0 and REN0 = 1. In other modes, a start bit when REN0 = 1 starts
–
–
–
–
–
–
S0CON
This bit places the 73S1217F into a power down state.
1 = UART loop back testing mode. The pins TXD and RXD are to be
connected together externally (with SLPBK =1) and therefore:
Selects either Serial_1 if set =1 or Serial_0 if set = 0 to be connected to
RXD and TXD pins.
–
SLPBK
is output as the 9th bit, and at receive, the 9th bit affects RB80 in
Table 37: The MISCtl0 Register
0
0
1
1
–
SSEL
0
1
0
1
–
0x00
Mode
normal using Serial_0
normal using Serial_1
Serial_0 TX feeds Serial_1 RX
Serial_1 TX feeds Serial_0 RX
0x00
Function
–
SLPBK
SSEL
LSB
Rev. 1.2
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