UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 561 of 841
NXP Semiconductors
UM10360
Chapter 27: LPC176x/5x Real-Time Clock (RTC) and backup registers
27.5 Pin description
27.6 Register description
The RTC includes a number of registers, shown in Table 507. Detailed descriptions of the
registers follow. In these descriptions, for most of the registers the Reset Value column
shows "NC", meaning that these registers are Not Changed by a Reset. Software must
initialize these registers between power-on and setting the RTC into operation. The
registers are split into five sections by functionality.
Table 506. RTC pin description
Name Type Description
RTCX1 I Input to the RTC oscillator circuit.
RTCX2 O Output from the RTC oscillator circuit.
Remark: If the RTC is not used, the RTCX1/2 pins can be left floating.
V
BAT
I RTC power supply: Typically connected to an external 3V battery. If this pin is not
powered, the RTC is still powered internally if
V
DD(REG)(3V3)
is present.
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