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參數(shù)資料
| 型號： | 16F630 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers |
| 中文描述： | 14引腳基于閃存的8位CMOS微控制器 |
| 文件頁數(shù)： | 71/132頁 |
| 文件大?。?/td> | 2651K |
| 代理商： | 16F630 |
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2003 Microchip Technology Inc.
DS40039C-page 69
PIC16F630/676
9.8
Code Protection
If the code protection bit(s) have not been
programmed, the on-chip program memory can be
read out for verification purposes.
9.9
ID Locations
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.
9.10
In-Circuit Serial Programming
The PIC16F630/676 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 micro-
controller 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 RA0 and RA1 pins low, while raising the
MCLR (V
PP
) pin from V
IL
to V
IHH
(see Programming
Specification). RA0 becomes the programming data
and RA1 becomes the programming clock. Both RA0
and RA1 are Schmitt Trigger inputs in this mode.
After RESET, to place the device into Programming/
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 PIC16F630/676 Programming Specification.
A typical In-Circuit Serial Programming connection is
shown in Figure 9-14.
FIGURE 9-14:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
9.11
In-Circuit Debugger
Since in-circuit debugging requires the loss of clock,
data and MCLR pins, MPLAB
ICD 2 development with
an 14-pin device is not practical. A special 20-pin
PIC16F676-ICD device is used with MPLAB ICD 2 to
provide separate clock, data and MCLR pins and frees
all normally available pins to the user.
This special ICD device is mounted on the top of the
header and its signals are routed to the MPLAB ICD 2
connector. On the bottom of the header is an 14-pin
socket that plugs into the user’s target via the 14-pin
stand-off connector.
When the ICD pin on the PIC16F676-ICD device is
held low, 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. Table 9-10
shows which features are consumed by the
background debugger:
TABLE 9-10:
DEBUGGER RESOURCES
For more information, see 14-Pin MPLAB ICD 2
Header Information Sheet (DS51299) available on
Microchip’s website (www.microchip.com).
Note:
The entire data EEPROM and FLASH
program memory will be erased when the
code protection is turned off. The INTOSC
calibration data is also erased. See
PIC16F630/676 Programming Specifica-
tion for more information.
I/O pins
ICDCLK, ICDDATA
Stack
1 level
Program Memory
Address 0h must be
NOP
300h - 3FEh
External
Connector
Signals
To Normal
Connections
To Normal
Connections
PIC16F630/676
V
DD
V
SS
RA3/MCLR/V
PP
RA1
RA0
+5V
0V
V
PP
CLK
Data I/O
V
DD
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