PO Box 462101 Garland, TX ... Voice: (972) 272-9392 FAX: (972) 494-5814 www.tech-tools.com

PO Box 462101    Garland,  TX  ... Voice: (972) 272-9392   FAX: (972) 494-5814 www.tech-tools.com
PO Box 462101 Garland, TX 75046-2101
Voice: (972) 272-9392 FAX: (972) 494-5814
[email protected]
CVM5XXM User’s Guide
The CVM5XXM Member module emulates the 14-pin PIC16C505 and the 8-pin PIC12C508,
PIC12C509, PIC12CE518, and PIC12CE519 micro-controllers. These devices are part of the 12
bit PICmicro family and therefore requires the 5X FAMILY module (CVM5XF) for operation.
The PIC12CE518 and PIC12CE519 devices have EEPROM support.
Due to BONDOUT limitations, the following features are either NOT SUPPORTED or are
modified slightly:
! 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.
! 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.
! 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 from their internal oscillator.
! 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
! 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.
! 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.
! EEPROM support for PIC12CE518 and PIC12CE519 devices are available on RA0 for SDA
(versus GPIO reg, bit 6 on an actual device) and RA1 for SCL (versus GPIO reg. bit 7 on an
actual device)
Attach the cable for 8-pin devices to JP8. The cable for 14-pin devices should be attached to
If the target permits, you can power the target from the emulator. To do so, place a jumper on
JP4 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.
JP5 & JP15: Pin 5 function (both jumpers should be in the same position)
functions as GP2.
functions as T0CKI
JP12*: Selects Pin 2 function
functions as GP5.
No connection.*
JP9*: Select Pin 3 function
functions as GP4.
No Connection*
* Since Mathias provides the clock for the bondout chip, JP12 and JP9 are usually set to the
GP position or removed completely. The no connection position is appropriate when your target
normally drives the OSC pins. This isolates the GP bits so that they are not in contention with
your target. NOTE: In either configuration, Mathias provides its own programmable clock,
making it easy to emulate a processor in either internal or external clock source mode.
JP6: Selects Pin 4 function
functions as GP2 with
the bondout MCLR
driven by Pin 4 with
tied to a weak pull to
a weak pullup to
Mathias VCC. (default)
Mathias VCC.
Functions as GP2 with
(the configuration to the left can cause
random resets if the target cable is not
attached to a target and JP1 is NOT
strapped to power the target. It is not
normally used.)
the bondout MCLR
tied to the TARGET
JP7, JP10, JP11, JP14 Weak Pull-ups
On the real devices, these three pull-ups are ALL ON or ALL OFF. To properly emulate this,
you should set ALL three jumpers to the ON position to enable the weak pull-ups. Conversely,
you should set ALL THREE jumpers to the OFF position to disable the weak pull-ups. These are
set to the ON position by default.
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