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8 / 115 page ST7LITEU05 ST7LITEU09 8/115 3 REGISTER & MEMORY MAP As shown in Figure 5, the MCU is capable of ad- dressing 64K bytes of memories and I/O registers. The available memory locations consist of 128 bytes of register locations, 128 bytes of RAM and 1 Kbytes of user program memory. The RAM space includes up to 64 bytes for the stack from 00C0h to 00FFh. The highest address bytes contain the user reset and interrupt vectors. The Flash memory contains two sectors (see Fig- ure 5) mapped in the upper part of the ST7 ad- dressing space so the reset and interrupt vectors are located in Sector 0 (FC00-FFFFh). The size of Flash Sector 0 and other device op- tions are configurable by Option byte. IMPORTANT: Memory locations marked as “Re- served” must never be accessed. Accessing a re- seved area can have unpredictable effects on the device. Figure 5. Memory Map Note: 1. DEE0h, DEE1h, DEE2h and DEE3h addresses are located in a reserved area but are special bytes containing also the RC calibration values which are read-accessible only in user mode. If all the EEPROM data or Flash space (including the RC calibration values locations) has been erased (after the read-out protection removal), then the RC calibration values can still be obtained through these addresses. 0000h RAM Flash Memory (2K) Interrupt & Reset Vectors HW Registers 0080h 007Fh (see Table 3) FFE0h FFFFh (see Table 0100h 00FFh Short Addressing RAM (zero page) 64-Byte Stack 00FFh 0080h 00C0h (128 Bytes) F800h F7FFh Reserved FFDFh 1 Kbyte 1 Kbyte SECTOR 1 SECTOR 0 2K FLASH FFFFh FC00h FBFFh F800h PROGRAM MEMORY DEE0h RCCRH0 RCCRL0 DEE1h see section 7.1 on page 22 RCCRH1 RCCRL1 DEE2h DEE3h DATA EEPROM 1080h 107Fh 1000h 0FFFh Reserved (128 Bytes) 1 |
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