Datasheet

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Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 28 November 2017

115436 32 of 222

NXP Semiconductors

PN532/C1

Near Field Communication (NFC) controller

• Mode 3:

– 11 bits are transmitted through UART_TX or received through UART_RX: a start

bit (0), 8 data bits (LSB first), a 9th data bit, and a stop bit (1). In fact, mode 3 is the

same as mode 2 in all aspects except the baud rate

– Transmit: as mode 2, the 9th data bit is taken from TB8 of S0CON

– Receive: as mode 2, the 9th data bit is stored into RB8 of S0CON

– Baud rate: depends on overflows of Timer1 or Timer2

The Debug UART initiates transmission and/or reception as follows.

• Transmission is initiated, in modes 0, 1, 2, 3, by any instruction that uses S0BUF as

destination

• Reception is initiated, in mode 0, if RI and REN in S0CON are set to logic 0 and 1

respectively

• Reception is initiated in modes 1, 2, 3 by the incoming start bit if REN in S0CON is set

to a logic 1

The Debug UART contains 2 SFRs:

Table 47. Debug UART SFR register list

Name Size [bytes] SFR address Description Access

S0CON 1 0098h Control and status register R/W

S0BUF 1 0099h Transmit and receive buffer R/W