STM8S003K3 STM8S003F3
SWIM
Product overview
Single wire interface module for direct access to the debug module and memory programming.
The interface can be activated in all device operation modes. The maximum data transmission
speed is 145 bytes/ms.
Debug module
The non-intrusive debugging module features a performance close to a full-featured emulator.
Beside memory and peripherals, also CPU operation can be monitored in real-time by means
of shadow registers.
R/W to RAM and peripheral registers in real-time
•
•
R/W access to all resources by stalling the CPU
•
Breakpoints on all program-memory instructions (software breakpoints)
•
Two advanced breakpoints, 23 predefined configurations
4.3
Interrupt controller
•
Nested interrupts with three software priority levels
•
32 interrupt vectors with hardware priority
•
Up to 27 external interrupts on 6 vectors including TLI
•
Up to 37 external interrupts on 6 vectors including TLI
•
Trap and reset interrupts
4.4
Flash program memory and data EEPROM
•
8 Kbytes of Flash program single voltage Flash memory
true data
•
128 bytes ofbyte area EEPROM
•
User option
Write protection (WP)
Write protection of Flash program memory and data EEPROM is provided to avoid unintentional
overwriting of memory that could result from a user software malfunction.
There are two levels of write protection. The first level is known as MASS (memory access
security system). MASS is always enabled and protects the main Flash program memory,
the data EEPROM, and the option bytes.
To perform in-application programming (IAP), this write protection can be removed by writing
a MASS key sequence in a control register. This allows the application to modify the content
of the main program memory and data EEPROM, or to reprogram the device option bytes.
A second level of write protection, can be enabled to further protect a specific area of memory
known as UBC (user boot code). Refer to the figure below.
The size of the UBC is programmable through the UBC option byte, in increments of 1 page
(64-byte block) by programming the UBC option byte in ICP mode.
This divides the program memory into two areas:
Main program memory: 8 Kbytes minus UBC
•
•
User-specific boot code (UBC): Configurable up to 8 Kbytes
DocID018576 Rev 2
11/99
STMICROELECTRONICS [ STMICROELECTRONICS ]
