SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
9.7.1 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.. As shown in Fig.
9-1 and Fig. 9-2
Fig. 9-1: Transmit mode 0 for Serial 0
Fig. 9-2: Receive mode 0 for Serial 0
9.7.2 Mode 1
Here Pin RXD0 serves as input, and TXD0 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 a stop bit sets the flag RB80 in the SFR S0CON. In
mode 1, either internal baud rate generator or timer 1 can be use to specify the desired baud rate. As shown in Fig. 9-3
and Fig. 9-4
Fig. 9-3: Transmit mode 1 for Serial 0
Fig. 9-4: Receive mode 1 for Serial 0
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M071
Ver A SM59A16U1 04/12/2013
- 66 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
