CVM50XM【PDF 1/2 页】MEMBER MOD PIC12C508/PIC12C509

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CVM50XM User’s Guide

9/25/97

The CVM50XM Member module emulates the PIC12C508 and PIC12C509 micro-controllers.

These devices are part of the 12 bit PICmicro family and therefore requires the 5X FAMILY

module (CVM5XF) for operation.

EMULATOR DISCREPENCIES:

Due to BONDOUT limitations, the following features are either NOT SUPPORTED or are

modified slightly:

n The Wake-Up on pin change feature is not supported. The GPWU bit (OPTION.7) has no

affect. And the corresponding flag GPWUF (STATUS.7) has no meaning.

n The “weak pull-up” resistors are enabled/disabled by hardware jumpers on the member pod

rather than through the GPPU bit (OPTION.6). This bit has no affect.

n Mathias provides the operating clock so the OSCCAL register has no affect. You can

program Mathias for any clock frequency between 30KHz and 20MHz. The real PIC devices

run at around 4 MHz.

n GP3 is an INPUT ONLY on the real device to accommodate that pin’s alternative use as

MCLR. The emulator provides a full INPUT/OUTPUT pin for this function. The MCLR

signal is brought into the bondout chip through a different connection. You should ALWAYS

SET the corresponding TRIS bit for GP3 to properly emulate this INPUT-ONLY behavior.

n In an actual device, setting the TOCS bit (OPTION.5) automatically forces GP2 to be an

input, over-riding the TRIS bit for GP2. The emulator DOES NOT automatically force GP2

to be an input. YOU MUST SET TRIS.2 YOURSELF, if you use GP2 as a T0CS input.

n In an actual device, GPIO bits 6 and 7 are not implemented and will always read back ‘0’. In

the emulator, these bits are actually present and will read back whatever was last written to

them if the corresponding TRIS bits are cleared. If these TRIS bits are SET, then these bits

read FLOATING inputs and their value is indeterminate.

JUMPER CONFIGURATIONS:

JP1: POWER

If the target permits, you can power the target from the emulator. To do so, place a jumper on JP1

between the center pin (+5EMU) and the pin marked +5VEXT. Moving the jumper the unmarked

position isolates the power rails. The default position is to ISOLATE the power rails.

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