ST72F321J ST Microelectronics, ST72F321J Datasheet - Page 18

• Manufacturer Part Number: ST72F321J
• Description: 8-BIT MCU
• Manufacturer: ST Microelectronics

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D a t a S h e e t
ST72321J
FLASH PROGRAM MEMORY (Cont’d)
4.5 ICP (In-Circuit Programming)
To perform ICP the microcontroller must be
switched to ICC (In-Circuit Communication) mode
by an external controller or programming tool.
Depending on the ICP code downloaded in RAM,
Flash memory programming can be fully custom-
ized (number of bytes to program, program loca-
tions, or selection serial communication interface
for downloading).
When using an STMicroelectronics or third-party
programming tool that supports ICP and the spe-
cific microcontroller device, the user needs only to
implement the ICP hardware interface on the ap-
plication board (see
the pin locations, refer to the device pinout de-
scription.
4.6 IAP (In-Application Programming)
This mode uses a BootLoader program previously
stored in Sector 0 by the user (in ICP mode or by
plugging the device in a programming tool).
This mode is fully controlled by user software. This
allows it to be adapted to the user application, (us-
er-defined strategy for entering programming
Table 4. Flash Control/Status Register Address and Reset Value
18/179
Address
(Hex.)
0029h
4
U
. c o m
FCSR
Reset Value
Register
Label
Figure
5). For more details on
7
0
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0
5
0
mode, choice of communications protocol used to
fetch the data to be stored, etc.). For example, it is
possible to download code from the SPI, SCI, USB
or CAN interface and program it in the Flash. IAP
mode can be used to program any of the Flash
sectors except Sector 0, which is write/erase pro-
tected to allow recovery in case errors occur dur-
ing the programming operation.
4.6.1 Register Description
FLASH CONTROL/STATUS REGISTER (FCSR)
Read /Write
Reset Value: 0000 0000 (00h)
This register is reserved for use by Programming
Tool software. It controls the Flash programming
and erasing operations. For details on customizing
Flash programming methods and In-Circuit Test-
ing, refer to the ST7 Flash Programming Refer-
ence Manual.
7
0
4
0
0
3
0
0
0
2
0
0
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1
0
0
0
0
0
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