SM59R16A5/SM59R09A5/SM59R05A5
8-Bit Micro-controller
64KB/36KB/20KB with ISP Flash
& 2KB RAM embedded
SM20: Enables multiprocessor communication feature
REN0: If set, enables serial reception. Cleared by software to disable reception.
TB80: The 9th transmitted data bit in modes 2 and 3. Set or cleared by the CPU
depending on the function it performs such as parity check, multiprocessor
communication etc.
RB80: In modes 2 and 3, it is the 9th data bit received. In mode 1, if SM20 is 0, RB80
is the stop bit. In mode 0, this bit is not used. Must be cleared by software.
TI0: Transmit interrupt flag, set by hardware after completion of a serial transfer.
Must be cleared by software.
RI0: Receive interrupt flag, set by hardware after completion of a serial reception.
Must be cleared by software.
Mnemonic: S1CON
Address: 9Bh
7
6
5
4
3
2
1
0
Reset
SM
-
SM21
REN1
TB81
RB81
TI1
RI1
00h
SM: Serial Port 1 mode select.
SM
0
1
Mode
A
B
The 2 modes in UART1, Mode A and Mode B, are explained later.
SM21: Enables multiprocessor communication feature.
REN1: If set, enables serial reception. Cleared by software to disable reception.
TB81: The 9th transmitted data bit in mode A. Set or cleared by the CPU depending on
the function it performs such as parity check, multiprocessor communication
etc.
RB81: In mode A, it is the 9th data bit received. In mode B, if SM21 is 0, RB81 is the
stop bit. Must be cleared by software.
TI1: Transmit interrupt flag, set by hardware after completion of a serial transfer.
Must be cleared by software.
RI1: Receive interrupt flag, set by hardware after completion of a serial reception.
Must be cleared by software.
9.1. Serial interface 0
The Serial Interface 0 can operate in the following 4 modes:
SM0
SM1
Mode
Description
Shift register
8-bit UART
9-bit UART
9-bit UART
Board Rate
0
0
1
1
0
1
0
1
0
1
2
3
Fosc/12
Variable
Fosc/32 or Fosc/64
Variable
Here Fosc is the crystal or oscillator frequency.
9.1.1. Mode 0
Pin RXD0 serves as input and output. TXD0 outputs the shift clock. 8 bits are transmitted with 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 the other modes, a start bit when REN0 = 1 starts receiving serial data.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M047
43
Ver.G SM59R16A5 01/2014
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
