Datasheet

Functional overview STM8S001J3
12/84 DocID030584 Rev 2
4.2 Single wire interface module (SWIM) and debug module (DM)
The single wire interface module and debug module permits non-intrusive, real-time in-
circuit debugging and fast memory programming.
SWIM
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 byte/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
Recommendation for SWIM pin (pin #8) sharing
As the NRST pin is not available on this device, if the SWIM pin should be used with the I/O
pin functionality, it is recommended to add a ~5 seconds delay in the firmware before
changing the functionality on the pin with SWIM functions. This action allows the user to set
the device into SWIM mode after the device power on and to be able to reprogram the
device. If the pin with SWIM functionality is set to I/O mode immediately after the device
reset, the device is unable to connect through the SWIM interface and it gets locked forever.
This initial delay can be removed in the final (locked) code.
4.3 Interrupt controller
• Nested interrupts with three software priority levels
• 32 interrupt vectors with hardware priority
• Up to 5 external interrupts including TLI
• Trap and reset interrupts
4.4 Flash program memory and data EEPROM
• 8 Kbytes of Flash program single voltage Flash memory
• 128 byte true data EEPROM
• User option byte area
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.
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