Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Instrukcja Użytkownika Pobierz pdf (Strona 44)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

10-1

ADDENDUM TO SECTION 10: SERIAL I/O MODULE

The MAXQ8913 provides one serial universal synchronous/asynchronous receiver-transmitter (USART) interface that

operates 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 SCON.6, #1 ; Set to mode 1 (10-bit asynchronous)

move SCON.4, #1 ; Enable receiver

move SMD.1, #1 ; Baud rate = 16 x baud clock

move PR, #007DDh ; P = 2^21 * 9600 / 10.000MHz

move SCON.0, #0 ; Clear received character flag

move SCON.1, #0 ; Clear transmit character flag

move Acc, #0Dh

call TxChar

move Acc, #0Ah

call TxChar

move Acc, #’>’

call TxChar

move Acc, #’ ‘

call TxChar

mainLoop:

call RxChar

call TxChar

jump mainLoop

SERIAL USART FUNCTION PIN MULTIPLEXED WITH GPIO

RX: Serial Receive M3 P1.1

TX: Serial Transmit N4 P1.0

SCON M1[00h] Serial Port Control Register. Serial port mode, receive enable, 9th bit control, and interrupt flags.

SBUF M1[01h] Serial Port Data Buffer. Input and output data buffer.

SMD M1[08h] Serial Port Mode Register. Controls baud rate, interrupt enable, and framing error detection.

PR M1[09h] Serial Port Phase Register. Contains counter reload value for baud-rate generation.

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Instrukcja Użytkownika Strona 44