Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Instrukcja Użytkownika Pobierz pdf (Strona 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

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.

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 146 147

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Instrukcja Użytkownika Strona 57