Maxim Integrated MAXQ Family Users Guide: MAXQ2010 Supplement - Manual (Page 57)

MAXQ Family User’s Guide:
MAXQ2010 Supplement
10-1
ADDENDUM TO SECTION 10: SERIAL I/O MODULE
The MAXQ2010 provides two serial universal synchronous/asynchronous receiver-transmitter (USART) interfaces
(serial 0 and 1) that operate as described in the MAXQ Family User’s Guide.
10.1 Serial USART I/O Pins and Control Registers
Table 10-1. Serial USART Input and Output Pins
Table 10-2. Serial USART Control Registers
10.2 Serial USART Code Examples
10.2.1 Serial USART Example: Echo Characters in 10-Bit Asynchronous Mode
move SCON0.6, #1 ; Set to mode 1 (10-bit asynchronous)
move SCON0.4, #1 ; Enable receiver
move SMD0.1, #1 ; Baud rate = 16 x baud clock
move PR0, #007DDh ; P = 2^21 * 9600 / 10.000MHz
move SCON0.0, #0 ; Clear received character flag
move SCON0.1, #0 ; Clear transmit character flag
move Acc, #0Dh
call TxChar0
move Acc, #0Ah
call TxChar0
move Acc, #’>’
call TxChar0
move Acc, #’ ‘
call TxChar0
SERIAL USART FUNCTION PIN MULTIPLEXED WITH GPIO
RX0: Serial 0 Receive 68 P5.0
TX0: Serial 0 Transmit 67 P5.1
RX1: Serial 1 Receive 28 P6.4
TX1: Serial 1 Transmit 25 P6.5
REGISTER ADDRESS FUNCTION
SCON0 M3[04h] Serial Port 0 Control Register. Serial port mode, receive enable, 9th bit control, and interrupt flags.
SBUF0 M3[05h] Serial Port 0 Data Buffer. Input and output data buffer.
SMD0 M3[08h] Serial Port 0 Mode Register. Controls baud rate, interrupt enable, and framing error detection.
PR0 M3[09h] Serial Port 0 Phase Register. Contains counter reload value for baud-rate generation.
SCON1 M3[06h] Serial Port 1 Control Register. Serial port mode, receive enable, 9th bit control, and interrupt flags.
SBUF1 M3[07h] Serial Port 1 Data Buffer. Input and output data buffer.
SMD1 M3[0Ah] Serial Port 1 Mode Register. Controls baud rate, interrupt enable, and framing error detection.
PR1 M3[0Bh] Serial Port 1 Phase Register. Contains counter reload value for baud-rate generation.