Datasheet
MSP430FR4133, MSP430FR4132, MSP430FR4131
www.ti.com
SLAS865B –OCTOBER 2014–REVISED AUGUST 2015
6.9.9 Real-Time Clock (RTC) Counter
The RTC counter is a 16-bit modulo counter that is functional in AM, LPM0, LPM3, and LPM3.5. This
module may periodically wake up the CPU from LPM0, LPM3, and LPM3.5 based on timing from a low-
power clock source such as the XT1 and VLO clocks. In AM, RTC can be driven by SMCLK to generate
high-frequency timing events and interrupts. The RTC overflow events trigger:
• Timer0_A3 CCR1B
• ADC conversion trigger when ADCSHSx bits are set as 01b
6.9.10 10-Bit Analog Digital Converter (ADC)
The 10-bit ADC module supports fast 10-bit analog-to-digital conversions with single-ended input. The
module implements a 10-bit SAR core, sample select control, reference generator and a conversion result
buffer. A window comparator with a lower and upper limit allows CPU independent result monitoring with
three window comparator interrupt flags.
The ADC supports 10 external inputs and four internal inputs (see Table 6-12).
Table 6-12. ADC Channel Connections
ADCSHSx ADC CHANNELS EXTERNAL PIN OUT
0 A0/Veref– P1.0
1 A1/Veref+ P1.1
2 A2 P1.2
3 A3 P1.3
4 A4
(1)
P1.4
5 A5 P1.5
6 A6 P1.6
7 A7 P1.7
8 A8 P8.0
(2)
9 A9 P8.1
(2)
10 Not Used N/A
11 Not Used N/A
12 On-chip Temperature Sensor N/A
13 Reference Voltage (1.5 V) N/A
14 DVSS N/A
15 DVCC N/A
(1) When A4 is used, the PMM 1.2-V reference voltage can be output to this pin by setting the PMM
control register. The 1.2-V voltage can be directly measured by A4 channel.
(2) P8.0 and P8.1 are only available in the LQFP-64 package.
The AD conversion can be started by software or a hardware trigger. Table 6-13 shows the trigger
sources that are available.
Table 6-13. ADC Trigger Signal Connections
ADCSHSx
TRIGGER SOURCE
Binary Decimal
00 0 ADCSC bit (software trigger)
01 1 RTC event
10 2 TA1.1B
11 3 TA1.2B
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