Datasheet

PN532_C1 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2017. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.6 — 28 November 2017
115436 97 of 222
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
[1] This wake-up event is latched. The firmware must set the status byte to logic 0 after reading it (by writing a
logic 1 to bit clear_wakeup_cond in register PCR Control)
[2] If this wake-up event does not last up to the CPU clock is available, it will not be available within the status
register; it is not latched when no CPU clock is available and it directly reflects the state of the event.
8.5.8.6 PCR Wakeupen register
Register Wakeupen allows the selection of different wake-up events.
Table 142. Description of PCR Status bits
Bit Symbol Description
7i
2
c_wu I2C wake-up event (on its own address). Set to logic 1, when PN532 woke up
due to recognition of its own I
2
C address appearing on I
2
C interface
[1]
.
6 gpirq_wu gpirq wake-up event (or function of P34, P35, P50_SCL and P71 signals
when enabled and level-controlled). Set to logic 1, when PN532 woke up from
a GIRQ event (GPIRQ at logic 0)
[2]
.
5SPI_wu SPI wake-up event (spi_on signal). Set to logic 1, when PN532 woke up from a
SPI event (NSS at logic 0)
[2]
.
4 HSU_wu HSU wake-up event (hsu_on signal). Set to logic 1, when PN532 woke up
from a HSU event (5 rising edges on HSU_RX)
[1]
.
3CIU_wu Contactless wake-up event. RF detected signal
[2]
or NFC-WI event
[1]
). Set to
logic 1, when PN532 woke up from a Contactless interrupt.
- - Reserved.
1 int1_wu P33_INT1 wake-up event. Set to logic 1, when the system woke up from a
P33_INT1 interrupt
[2]
.
0 int0_wu P32_INT0 wake-up event. Set to logic 1, when the system woke up from a
P32_INT0 interrupt.
[2]
.
Table 143. PCR Wakeupen register (address 6205h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol i
2
c_wu_
en
GPIRQ_
wu_en
SPI_on_
en
HSU_on_
en
CIU_wu_
en
- int1_en int0_en
Reset 00000000
Access R/W R/W R/W R/W R/W R R/W R/W
Table 144. Description of PCR Wakeupen bits
Bit Symbol Description
7i
2
c_wu_en I2C wake-up source enable. When set to logic 1, I
2
C event (recognition
of its own address) can wake up PN532.
See Table 90 on page 65
to enable the corresponding event.
6 GPIRQ_wu_en General Purpose IRQ wake-up source enable. When set to logic 1, a
GPIRQ event can wake up PN532.
5 SPI_on_en SPI wake-up source enable. When set to logic 1, a SPI event can wake
up PN532.
4 HSU_on_en HSU wake-up source enable. When set to logic 1, an HSU event can
wake up PN532.
See Table 114 on page 77
to enable the corresponding event.
3 CIU_wu_en Contactless Interface Unit wake-up source enable. When set to
logic 1, a CIU event (RF detected or NFC-WI event) can wake up PN532.