JAJSDR7E February 2016 – December 2019 MSP430FR2310 , MSP430FR2311
PRODUCTION DATA.
The clock system includes a 32-kHz low-frequency oscillator (XT1 low frequency) or up to a 16-MHz high-frequency crystal oscillator (XT1 high frequency), an internal very low-power low-frequency oscillator (VLO), an integrated 32-kHz RC oscillator (REFO), an integrated internal digitally controlled oscillator (DCO) that can use frequency-locked loop (FLL) locking with internal or external 32-kHz reference clock, and on-chip asynchronous high-speed clock (MODOSC). The clock system is designed to target cost-effective designs with minimal external components. A fail-safe mechanism is designed for XT1. The clock system module offers the following clock signals.
All peripherals may have one or several clock sources depending on specific functionality. Table 6-8 and Table 6-9 show the clock distribution used in this device.
CLOCK SOURCE SELECT BITS(1) | MCLK | SMCLK | ACLK | MODCLK | VLOCLK | EXTERNAL PIN | |
---|---|---|---|---|---|---|---|
Frequency Range | DC to 16 MHz | DC to 16 MHz | DC to 40 kHz | 5 MHz ±10% | 10 kHz ±50% | – | |
CPU | N/A | Default | – | – | – | – | – |
FRAM | N/A | Default | – | – | – | – | – |
RAM | N/A | Default | – | – | – | – | – |
CRC | N/A | Default | – | – | – | – | – |
I/O | N/A | Default | – | – | – | – | |
TB0 | TBSSEL | – | 10b | 01b | – | – | 00b (TB0CLK pin) |
TB1 | TBSSEL | – | 10b | 01b | – | – | 00b (TB1CLK pin) |
eUSCI_A0 | UCSSEL | – | 10b or 11b | 01b | – | – | 00b (UCA0CLK pin) |
eUSCI_B0 | UCSSEL | – | 10b or 11b | 01b | – | – | 00b (UCB0CLK pin) |
WDT | WDTSSEL | – | 00b | 01b | – | 10b | – |
ADC | ADCSSEL | – | 10b or 11b | 01b | 00b | – | – |
RTC | RTCSS | – | 01b(2) | 01b(2) | – | 11b | – |
OPERATION MODE | CLOCK SOURCE SELECT BITS | XTHFCLK | XTLFCLK | XTLFCLK (LPMx.5) |
---|---|---|---|---|
AM TO LPM0 | AM TO LPM3 | AM TO LPM3.5 | ||
MCLK | SELMS | 10b | 10b | 10b |
SMCLK | SELMS | 10b | 10b | 10b |
REFO | SELREF | 0b | 0b | 0b |
ACLK | SELA | 0b | 0b | 0b |
RTC | RTCSS | – | 10b | 10b |