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參數(shù)資料
| 型號： | P12C508 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 36/84頁 |
| 文件大?。?/td> | 526K |
| 代理商： | P12C508 |
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PIC12C5XX
DS40139A-page 36
Advanced Information
1996 Microchip Technology Inc.
7.12
In-Circuit Serial Programming
The PIC12C5XX 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, and the 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 GP1 and GP0 pins low while raising the
MCLR (V
PP
) pin from V
IL
to V
IHH
(see programming
specification). GP1 becomes the programming clock
and GP0 becomes the programming data. Both GP1
and GP0 are Schmitt Trigger inputs in this mode.
After reset, a 6-bit command is then supplied to the
device. Depending on the command, 14-bits of pro-
gram data are then supplied to or from the device,
depending if the command was a load or a read. For
complete details of serial programming, please refer to
the PIC12C5XX Programming Specifications.
A typical in-circuit serial programming connection is
shown in Figure 7-15.
FIGURE 7-15: TYPICAL IN-CIRCUIT SERIAL
PROGRAMMING
CONNECTION
External
Connector
Signals
To Normal
Connections
To Normal
Connections
PIC12C5XX
V
DD
V
SS
MCLR/V
PP
GP1
GP0
+5V
0V
V
PP
CLK
Data I/O
V
DD
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