ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 20

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10k write/erase cycles guaranteed Data retention
• 128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
• A/d Converter: 10 input channels

Flash programmable memory
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Flash programmable memory
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 programming.
The array matrix organization allows each sector to be erased and reprogrammed without
affecting other sectors.
Main features
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Programming modes
The ST7 can be programmed in three different ways:
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In-circuit programming (ICP)
ICP uses a protocol called ICC (in-circuit communication) which allows an ST7 plugged on a
printed circuit board (PCB) to communicate with an external programming device connected
via cable. ICP is performed in three steps:
Switch the ST7 to ICC mode (in-circuit communications). This is done by driving a specific
signal sequence on the ICCCLK/DATA pins while the RESET pin is pulled low. When the
ST7 enters ICC mode, it fetches a specific reset vector which points to the ST7 System
Memory containing the ICC protocol routine. This routine enables the ST7 to receive bytes
from the ICC interface.
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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
Insertion in a programming tool. In this mode, Flash sectors 0 and 1, option byte row
and data EEPROM (if present) can be programmed or erased.
In-circuit programming. In this mode, Flash sectors 0 and 1, option byte row and data
EEPROM (if present) can be programmed or erased without removing the device from
the application board.
In-application programming. In this mode, sector 1 and data EEPROM (if present) can
be programmed or erased without removing the device from the application board and
while the application is running.
Download ICP Driver code in RAM from the ICCDATA pin
Execute ICP Driver code in RAM to program the Flash memory
Doc ID 13562 Rev 3
ST7LITE49M