1998 Microchip Technology Inc. DS40175A-page 1
PIC12C67X AND PIC12CE67X

This document includes the programming
specifications for the following devices:

1.0 PROGRAMMING THE
PIC12C67X AND PIC12CE67X

The PIC12C67X and PIC12CE67X can be pro-
grammed using a serial method. In serial mode the
PIC12C67X and PIC12CE67X can be programmed
while in the users system. This allows for increased
design flexibility.

1.1 Hardware Requirements

The PIC12C67X and PIC12CE67X requires two pro-
grammable power supplies, one for V

DD

(2.0V to 6.0V
recommended) and one for V

PP

(12V to 14V). Both
supplies should have a minimum resolution of 0.25V.

1.2 Programming Mode

The programming mode for the PIC12C67X and
PIC12CE67X allows programming of user program
memory, special locations used for ID, and the configu-
ration word for the PIC12C67X and PIC12CE67X.
• PIC12C671
• PIC12C672
• PIC12CE673
• PIC12CE674

Pin Diagram:
PDIP
8
7
6
5
1
2
3
4
PIC12C67X
GP5/OSC1/CLKIN
GP4/OSC2/AN3/
GP3/MCLR/VPP
VDD
VSS
GP0/AN0
GP1/AN1/VREF
GP2/T0CKI/
AN2/INT
CLKOUT
PIC12CE67X

EPROM Memory Programming Specification

PIN DESCRIPTIONS (DURING PROGRAMMING): PIC12C671/672 and PIC12CE673/674

Pin Name
During Programming
Pin Name Pin Type Pin Description

GP1 CLOCK I Clock input
GP0 DATA I/O Data input/output
GP3/MCLR/V

PP

V

PP

P Programming Power
V

DD

V

DD

P Power Supply
V

SS

V

SS

P Ground

Legend: I = Input, O = Output, P = Power