Texas Instruments MSP50C6xx manual Crystal Reference Oscillator Connections

Functional Description for the MSP50C614

Figure 1–2. Oscillator and PLL Connection

a) Crystal Reference Oscillator Connections

MSP50P614

MSP50C6xx

	OSCIN	OSCOUT	PLL
	10 MΩ †
	32.768 kHz†
10 MΩ †	22 pF†	22 pF†	C(PLL) = 3300 pF†

†Keep these components as close as possible to the OSCIN, OSCOUT, and PLL pins.

b)Resistor Trim Oscillator Connections

MSP50C6xx

MSP50P614

OSCIN OSCOUTPLL

R(RTO) = 470 kΩ 1%†

C(PLL) = 3300 pF†

† Keep these components as close as possible to the OSCIN, OSCOUT, and PLL pins.

The peripheral consists of five 8-bit wide general-purpose I/O ports, one 8-bit wide dedicated input port, and one 16-bit wide dedicated output port. The general-purpose I/O ports are bit-wise programmable as either high-impedance inputs or as totem-pole outputs. They are controlled via addressable I/O registers. The input-only port has a programmable pullup option (100-kΩminimum resistance) and a dedicated service interrupt. These features make the input port especially useful as a key-scan interface.

A simple one-bit comparator is also included in the periphery. The comparator is enabled by a control register, and its input pins are shared with two pins in one of the general-purpose I/O ports.

Introduction to the MSP50C6xx 1-7