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W925G240 Datasheet(PDF) 9 Page - Winbond |
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W925G240 Datasheet(HTML) 9 Page - Winbond |
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9 / 73 page  W925E/C240 Publication Release Date: July 12, 2005 - 9 - Revision A10 Power Management The W925E/C240 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/C240 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/C240 can be up to 256K bytes that are divided into 4 pages, each page has the size of 64K bytes. The upper 128K bytes are used to store the op-codes and the whole 256K can be used to store look-up table data. Because the op-code is 64K addressable, a PG bit in PAGE register decides which ROM page between page0, page1 is enabled, and the ALU fetches the op-code from the selected ROM page. If PG=0, ALU fetches the op-code from page0. If PG=1, ALU fetches the op-code from page1. When MOVC instruction is executed, ALU fetches the look-up table data according the indication of LT1 and LT0 bits. The value of LT1 and LT0 indicates which ROM page is active for look-up table instruction. 64K Page0 64K Page3 64K Page2 64K Page1 3FFFF 0FFFF 1FFFF 2FFFF 30000 00000 10000 20000 PG=0 PG=1 LT1,0 =00 LT1,0 =01 LT1,0 =10 LT1,0 =11 Figure 6-1 Program Memory Map |
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