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W79L549A25PN Datasheet(PDF) 9 Page - Winbond |
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W79L549A25PN Datasheet(HTML) 9 Page - Winbond |
9 / 81 page W79E549/W79L549 Publication Release Date: December 11, 2005 - 9 - Revision A1 Timers The W79E(L)549 has three 16-bit timers that are functionally similar to the timers of the 8052 family. When used as timers, they can be set to run at either 4 clocks or 12 clocks per count, thus providing the user with the option of operating in a mode that emulates the timing of the original 8052. The W79E(L)549 has an additional feature, the watchdog timer. This timer is used as a System Monitor or as a very long time period timer. Interrupts The Interrupt structure in the W79E(L)549 is slightly different from that of the standard 8052. Due to the presence of additional features and peripherals, the number of interrupt sources and vectors has been increased. The W79E(L)549 provides 7 interrupt resources with two priority level, including 2 external interrupt sources, timer interrupts, serial I/O interrupts. Power Management Like the standard 80C52, the W79E(L)549 also has IDLE and POWER DOWN modes of operation. In the IDLE mode, the clock to the CPU core is stopped while the timers, serial port and interrupts clock continue to operate. In the POWER DOWN mode, all the clock are stopped and the chip operation is completely stopped. This is the lowest power consumption state. On-chip Data SRAM The W79E(L)549 has 1K Bytes of data space SRAM which is read/write accessible and is memory mapped. This on-chip MOVX SRAM is reached by the MOVX instruction. It is not used for executable program memory. There is no conflict or overlap among the 256 bytes Scratchpad RAM and the 1K Bytes MOVX SRAM as they use different addressing modes and separate instructions. The on-chip MOVX SRAM is enabled by setting the DME0 bit in the PMR register. After a reset, the DME0 bit is cleared such that the on-chip MOVX SRAM is disabled, and all data memory spaces 0000H − FFFFH access to the external memory. |
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