MCP1726T-ADJZEMF Microchip Technology, MCP1726T-ADJZEMF Datasheet - Page 100

• Manufacturer Part Number: MCP1726T-ADJZEMF
• Description: Regulator, Extended Industrial, HVSON, 8-Pin|
• Manufacturer: Microchip Technology

PIC12F683
12.8
If
programmed, the on-chip program memory can be
read out using ICSP for verification purposes.
12.9
Four memory locations (2000h-2003h) are designated
as ID locations where the user can store checksum or
other code identification numbers. These locations are
not accessible during normal execution but are
readable and writable during Program/Verify. Only the
Least Significant 7 bits of the ID locations are used.
12.10 In-Circuit Serial Programming
The PIC12F683 microcontrollers can be serially
programmed while in the end application circuit. This
is simply done with two lines for clock and data, and
three other lines for:
• power
• ground
• programming voltage
This allows customers to manufacture boards with
unprogrammed devices and then program the
microcontroller just before shipping the product. This
also allows the most recent firmware or a custom
firmware to be programmed.
The device is placed into a Program/Verify mode by
holding the GP0 and GP1 pins low, while raising the
MCLR (V
Specification). GP0 becomes the programming data
and GP1 becomes the programming clock. Both GP0
and GP1 are Schmitt Trigger inputs in this mode.
After Reset, to place the device into Program/Verify
mode, the program counter (PC) is at location 00h. A
6-bit command is then supplied to the device.
Depending on the command, 14 bits of program data
are then supplied to or from the device, depending on
whether the command was a load or a read. For
complete details of serial programming, please refer to
the PIC12F683 Programming Specification.
A typical In-Circuit Serial Programming connection is
shown in Figure 12-14.
DS41211A-page 98
Note:
the
Code Protection
ID Locations
code
PP
The entire data EEPROM and Flash
program memory will be erased when the
code
PIC12F683 Programming Specification for
more information.
) pin from V
protection
protection
IL
to V
bit(s)
is
IHH
turned
(see Programming
have
not
Advance Information
off.
been
See
FIGURE 12-14:
* Isolation devices (as required)
External
Connector
Signals
Data I/O
CLK
+5V
V
0V
PP
*
To Normal
Connections
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
*
 2003 Microchip Technology Inc.
*
*
V
V
MCLR/
GP1
GP0
DD
SS
PIC12F683
V
PP
/GP3