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 29 of 222
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
8.1.7.3 T2MOD register
This Special Function Register is used to configure Timer2.
Table 37. Timer2 T2MOD register (SFR address C9h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol -----T2RD-DCEN
Reset 00000000
Access RRRRRRR/WR/W
Table 38. Description of TMOD bits
Bit Symbol Description
7 to 3 - Reserved.
2T2RDTimer2 ReaD flag. Set by hardware and firmware.
This bit is set to logic 1 by hardware, if T2H is incremented between reading
T2L and reading T2H. This bit is set to logic 0, on the trailing edge of next
T2L read.
This bit is used to indicate that the16 bit Timer2 register is not read properly
since the T2H part was incremented by hardware before it was read.
1- Reserved
0 DCEN Timer2 Down Count ENable. Set by firmware only.
When this bit is set, Timer2 can be configured (in auto_reload mode) as an
up-counter.
When this bit is reset, Timer2 can be configured (in auto-reload mode) as a
down-counter.