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MAXQ3210-EMX Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAXQ3210-EMX Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 28 page  Stack Memory A 16-bit-wide internal stack provides storage for pro- gram return addresses and general-purpose use. The stack is used automatically by the processor when the CALL, RET, and RETI instructions are executed and interrupts serviced. The PUSH, POP, and POPI instruc- tions can also be used explicitly to store and retrieve data to/from the stack. For the MAXQ3210, the stack is four levels deep. On reset, the stack pointer, SP, initializes to the top of the stack (03h). The CALL, PUSH, and interrupt-vector- ing operations increment SP, then store a value at the stack location pointed to by SP. The RET, RETI, POP, and POPI operations retrieve the value at the stack location pointed to by SP, and then decrement SP. Utility ROM The utility ROM is a block of internal memory that starts at address 8000h. The utility ROM consists of subrou- tines that can be called from application software. These include: • In-system programming (bootloader) over JTAG interface • In-circuit debug routines • Test routines (internal memory tests, memory loader, etc.) • User-callable routines for in-application EEPROM programming and fast table lookup Routines within the utility ROM are user-accessible and can be called as subroutines by the application soft- ware. More information on the utility ROM contents is contained in the user’s guide for this device. Some applications require protection against unautho- rized viewing of program code memory. For these applications, access to in-system programming or in- circuit debugging functions is prohibited until a pass- word has been supplied. The password is defined as the 16 words of physical program memory at address- es x0010h to x001Fh. A single Password Lock (PWL) bit is implemented in the SC register. When the PWL is set to one (power-on reset default), the password is required to access the utility ROM, including in-circuit debug and in-system programming routines that allow reading or writing of internal memory. When PWL is cleared to zero, these utilities are fully accessible without the password. The password is automatically set to all zeros following a mass erase. An additional Code Lock bit set from the bootloader prevents any access to the device, even through the password. The device must be erased by the mass erase operation to clear the Code Lock bit before the device can be reprogrammed. Programming The microcontroller’s EEPROM can be programmed by two different methods: in-system programming and in- application programming. Both methods afford great flexibility in system design as well as reduce the life- cycle cost of the embedded system. In-system pro- gramming can be password protected to prevent unauthorized access to code memory. In-System Programming An internal bootloader allows the device to be reloaded over a simple JTAG interface. As a result, system soft- ware can be upgraded in-system, eliminating the need for a costly hardware retrofit when software updates are required. Remote software uploads are possible that enable physically inaccessible applications to be fre- quently updated. The interface hardware can be a JTAG connection to another microcontroller, or a con- nection to a PC serial port using a serial to JTAG con- verter such as the MAXQJTAG-001, available from Dallas Semiconductor. If in-system programmability is not required, a commercial gang programmer can be used for mass programming. Activating the JTAG interface and sending the system programming instruction invokes the bootloader. Setting the SPE bit to 1 during reset through the JTAG interface executes the bootloader-mode program that resides in the utility ROM. When programming is com- plete, the bootloader can clear the SPE bit and reset the device, allowing the device to bypass the utility ROM and begin execution of the application software. Optionally, the bootloader can be invoked by the appli- cation code. The following bootloader functions are supported: • Load • Dump • CRC • Verify • Erase Microcontroller with Internal Voltage Regulator, Piezoelectric Horn Driver, and Comparator 10 ____________________________________________________________________ |
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