MAXQ2010-RFX+ datasheet(25/34 Pages) MAXIM

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16-Bit Mixed-Signal Microcontroller

with LCD Interface

______________________________________________________________________________________

Supply Voltage Monitor

The supply voltage monitor can detect if the supply volt-

age has fallen below a user-selectable level. If this hap-

pens, the microcontroller can be programmed to

generate an interrupt to inform the system. The detec-

tion level is set using the supply voltage threshold bit

(SVTH) and can be adjusted from 2.7V to 3.5V in 0.1V

increments. Setting the SVMEN bit to 1 enables the sup-

ply voltage monitor. Once the monitoring circuitry is sta-

ble and ready for operation, the supply voltage monitor

ready (SVMRDY) flag is set to 1. The default set point is

2.7V (SVTH[3:0] = 07h). Care must be taken not to set

the set point below 2.7V as SVM interrupts may not

occur because the brownout monitor may activate first.

The supply voltage monitor causes a switchback to

occur if the supply voltage falls below the threshold

value and the supply voltage monitor interrupt is

enabled (SVMIE = 1).

The supply voltage monitor remains operational in stop

mode if the supply voltage monitor stop mode enable

bit (SVMSTOP) is set to 1. Clearing SVMSTOP to 0 dis-

ables the supply voltage monitor on entry to stop mode

if the SVM peripheral is enabled. If the supply voltage

monitor is enabled during stop mode, an SVMI interrupt

causes the processor to exit stop mode if enabled

(SVMIE = 1).

Serial Peripherals

The microcontroller supports two independent USARTs

as well as I2C master/slave and SPI master communi-

cation ports.

USART Serial Ports

The independent USARTs provide transmit and receive

signals to communicate with other RS-232 interface-

enabled devices, as well as PCs and serial modems

when paired with an external RS-232 line driver/receiver.

The dual independent USARTs can communicate simulta-

neously at different baud rates with two separate periph-

erals. The USART can detect framing errors and indicate

the condition through a user-accessible software bit.

PD.x

SF DIRECTION

SF ENABLE

PO.x

VDDIO

SF OUTPUT

VDDIO

WEAK

I/O PAD

PORT PIN

INTERRUPT

FLAG

PI.x OR SF INPUT

EIES.x

TYPE D PORT ONLY

DETECT

CIRCUIT

MAXQ2010

Figure 6. Type C/D Port Pin Schematic

MAXQ2010-RFX+ Datasheet(PDF) 25 Page - Maxim Integrated Products

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