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W925E625FG Datasheet(PDF) 9 Page - Winbond |
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W925E625FG Datasheet(HTML) 9 Page - Winbond |
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9 / 75 page  W925E/C625 Publication Release Date: July 4, 2005 - 9 - Revision A10 Interrupts: The W925E/C625 provides 11 interrupt resources with two priority level, including 4 external interrupt sources, 2 timer interrupts, 1 CID interrupt, 1 divider interrupt, 1 serial port interrupt, 1 comparator interrupt and 1 watchdog timer interrupt. Power Management: The W925E/C625 has IDLE and POWER DOWN modes of operation. In the IDLE mode, the clock to the CPU core is stopped however the functions of the timers, divider, CID and interrupts are active continuously. In the POWER DOWN mode, both of the system clock stop oscillating and the chip operation is completely stopped. POWER DOWN mode is the state of the lowest power consumption. 6.1 Memory Organization The W925E/C625 separates the memory into two separate sections, the Program Memory and the Data Memory. The Program Memory is used to store the instruction op-codes and look-up table data, while the Data Memory is used to store data or for memory mapped devices. Program Memory: The Program Memory on the W925E/C625 can be up to 64K bytes. The total 64K bytes EEPROM/MASK ROM are used to store the op-codes and the whole 64K can be used to store look- up table data. 64K bytes EEPROM / MASK ROM 0FFFF 00000 Figure 6-1 Program Memory Map Data Memory: The W925E/C625 contains on-chip 4K + 224 bytes MOVX RAM of Data Memory, which can only be accessed by MOVX instructions from the address 0000H to 0FFFH and from 2000H to 20FEH. In addition, the W925E/C625 has 256 bytes of on-chip scratchpad RAM. This can be accessed either by direct addressing or by indirect addressing. There are also Special Function Registers (SFRs), which can only be accessed by direct addressing. Since the scratchpad RAM is only 256 bytes, it can be used only when data contents are small. In the event that larger data contents are present, the only one selection is on-chip MOVX RAM. The on-chip MOVX RAM can only be accessed by a MOVX instruction. However, the on-chip RAM has the fastest access times. The memory map is shown Figure 6-2 and Figure 6-3 shows the scratchpad RAM/Register addressing. |
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