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ST7LITEU05 датащи(PDF) 11 Page - STMicroelectronics

номер детали ST7LITEU05
подробное описание детали  8-bit MCU with single voltage Flash memory, ADC, timers
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST7LITEU05 датащи(HTML) 11 Page - STMicroelectronics

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4 FLASH PROGRAM MEMORY
4.1 Introduction
The ST7 single voltage extended Flash (XFlash) is
a non-volatile memory that can be electrically
erased and programmed either on a byte-by-byte
basis or up to 32 bytes in parallel.
The XFlash devices can be programmed off-board
(plugged in a programming tool) or on-board using
In-Circuit Programming or In-Application Program-
ming.
The array matrix organisation allows each sector
to be erased and reprogrammed without affecting
other sectors.
4.2 Main Features
ICP (In-Circuit Programming)
IAP (In-Application Programming)
ICT (In-Circuit Testing) for downloading and
executing user application test patterns in RAM
Sector 0 size configurable by option byte
Read-out and write protection
4.3 PROGRAMMING MODES
The ST7 can be programmed in three different
ways:
– Insertion in a programming tool. In this mode,
FLASH sectors 0 and 1 and option byte row
can be programmed or erased.
– In-Circuit Programming. In this mode, FLASH
sectors 0 and 1 and option byte row can be
programmed or erased without removing the
device from the application board.
– In-Application Programming. In this mode,
sector 1 can be programmed or erased with-
out removing the device from the application
board and while the application is running.
4.3.1 In-Circuit Programming (ICP)
ICP uses a protocol called ICC (In-Circuit Commu-
nication) which allows an ST7 plugged on a print-
ed circuit board (PCB) to communicate with an ex-
ternal programming device connected via cable.
ICP is performed in three steps:
– Switch the ST7 to ICC mode (In-Circuit Commu-
nications). This is done by driving a specific sig-
nal sequence on the ICCCLK/DATA pins while
the RESET pin is pulled low. When the ST7 en-
ters ICC mode, it fetches a specific RESET vec-
tor which points to the ST7 System Memory
containing the ICC protocol routine. This routine
enables the ST7 to receive bytes from the ICC in-
terface.
– Download ICP Driver code in RAM from the IC-
CDATA pin
– Execute ICP Driver code in RAM to program the
FLASH memory
Depending on the ICP Driver code downloaded in
RAM, FLASH memory programming can be fully
customized (number of bytes to program, program
locations, or selection of the serial communication
interface for downloading).
4.3.2 In Application Programming (IAP)
This mode uses an IAP Driver program previously
programmed in Sector 0 by the user (in ICP
mode).
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
mode, choice of communications protocol used to
fetch the data to be stored etc.)
IAP mode can be used to program any memory ar-
eas except Sector 0, which is write/erase protect-
ed to allow recovery in case errors occur during
the programming operation.
1


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