PIC16F946 Datasheet, PDF (213/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

16.11 In-Circuit Debugger
The PIC16F946-ICD can be used in any of the package
types. The device will be mounted on the target appli-
cation board, which in turn has a 3 or 4 wire connection
to the ICD tool.
When the debug bit in the Configuration Word
(CONFIG<12>) is programmed to a ‘0’, the In-Circuit
Debugger functionality is enabled. This function allows
simple debugging functions when used with MPLAB^®
ICD 2. When the microcontroller has this feature
enabled, some of the resources are not available for
general use. See Table 16-9 for more detail.
Note: The user’s application must have the
circuitry required to support ICD
functionality. Once the ICD circuitry is
enabled, normal device pin functions on
RB6/ICSPCLK/ICDCK/SEG14
and
RB7/ICSPDAT/ICDDAT/SEG13 will not be
usable. The ICD circuitry uses these pins for
communication with the ICD2 external
debugger.
PIC16F946
For more information, see “Using MPLAB^® ICD 2”
(DS51265), available on Microchip’s web site
(www.microchip.com).
16.11.1 ICD PINOUT
The devices in the PIC16F946 device carries the
circuitry for the In-Circuit Debugger on-chip and on
existing device pins. This eliminates the need for a
separate die or package for the ICD device. The pinout
for the ICD device is the same as the devices (see
Section 1.0 “Device Overview” for complete pinout
and pin descriptions). Table 16-9 shows the location
and function of the ICD related pins on the 28 and 40
pin devices.
TABLE 16-9: PIC16F946-ICD PIN DESCRIPTIONS
Pin
Name
Type
Pull-up
Description
24
ICDDATA
TTL
—
In Circuit Debugger Bidirectional data
23
ICDCLK
ST
—
In Circuit Debugger Bidirectional clock
36
MCLR/VPP
HV
—
Programming voltage
10, 19, 38, 57
VDD
P
—
9, 20, 41, 56
VSS
P
—
26
AVDD
P
—
25
AVDD
P
—
Legend: TTL = TTL input buffer, ST = Schmitt Trigger input buffer, P = Power, HV = High Voltage
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 211