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W77E058A40DL Datasheet(PDF) 8 Page - Winbond |
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W77E058A40DL Datasheet(HTML) 8 Page - Winbond |
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8 / 87 page  W77E058A - 8 - Timers The W77E058 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 W77E058 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 W77E058 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 W77E058 provides 12 interrupt resources with two priority level, including six external interrupt sources, timer interrupts, serial I/O interrupts. Data Pointers The original 8052 had only one 16-bit Data Pointer (DPL, DPH). In the W77E058, there is an additional 16-bit Data Pointer (DPL1, DPH1). This new Data Pointer uses two SFR locations which were unused in the original 8052. In addition there is an added instruction, DEC DPTR (op-code A5H), which helps in improving programming flexibility for the user. Power Management Like the standard 80C52, the W77E058 also has IDLE and POWER DOWN modes of operation. The W77E058 provides a new Economy mode which allow user to switch the internal clock rate divided by either 4, 64 or 1024. In the IDLE mode, the clock to the CPU core is stopped while the timers, serial ports 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 W77E058 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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