User`s guide

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Simulator Overview

A WDT time-out is simulated when WDT is enabled, proper pre/postscaler is set and

WDT actually overflows. On WDT time-out, the simulator will halt or Reset, depending

on the selection in the Break Options tab of the Settings dialog.

16.3.3.3 14-BIT CORE PERIPHERALS

Along with core support, MPLAB SIM supports the following peripheral modules, in

addition to general purpose I/O. Consult the data sheet for the particular device you are

using for information on which symbols are implemented.

•Timers

• CCP/ECCP

• Comparators (Limited)

• A/D Converter (Limited)

•USART

• EEPROM Data Memory

The delays are implemented on all peripherals, but the interrupt latency is not.

Timers

Timer0 (and the interrupt it can generate on overflow) is fully supported, and will incre-

ment by the internal or external clock. Clock input must have a minimum high time of 1

CY and a minimum low time of 1 TCY due to stimulus requirements.

Timer1 in its various modes is supported, except when running in counter mode by an

external crystal. MPLAB SIM supports Timer1 interrupts generated on overflow, and

interrupts generated by wake-up from sleep. The external oscillator on RC0/RC1 is not

simulated, but a clock stimulus can be assigned to those pins.

Timer2 and the interrupt that can be generated on overflow are fully supported.

CCP/ECCP

Capture

MPLAB SIM fully supports capture and the interrupt generated.

Compare

MPLAB SIM supports compare mode, its interrupt and the special event trigger

(resetting Timer1 by CCP1).

PWM

PWM output is supported (resolution greater than 1 T

CY only).

Comparators (Limited)

Only comparator modes that do not use Vref are simulated in MPLAB SIM.

Because simulation is to the register level, and not the pin level, bit/pin names will be

read as ‘0’, as required for analog, although injected stimulus may have actually

changed the value to ‘1’.

Toggling a comparator pin will not work since toggling involves reading a value and

inverting it. Since the value always reads ‘0’, the bit/pin never toggles. Instead, use two

statements to toggle a comparator pin, e.g.,

• RA1 set low

• RA1 set high

Note: Even if peripheral functionality is not supported in the simulator, the

peripheral registers will be available as read/write.