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AT89LP213-20XU Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89LP213-20XU Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 96 page  7 3538C–MICRO–06/08 AT89LP213/214 5.6 Watchdog Timer The Watchdog Timer in AT89LP213/214 counts at a rate of once per clock cycle. This compares to once every 12 clocks in the standard 8051. A common prescaler is available to divide the time base for all timers and reduce the counting rate. 5.7 I/O Ports The I/O ports of the AT89LP213/214 may be configured in four different modes. By default all the I/O ports revert to input-only (tristated) mode at power-up or reset. In the standard 8051, all ports are weakly pulled high during power-up or reset. To enable 8051-like ports, the ports must be put into quasi-bidirectional mode by clearing the P1M0 and P3M0 SFRs. The user can also configure the ports to start in quasi-bidirectional mode by disabling the Tristate-Port User Fuse. When this fuse is disabled, P1M0 and P3M0 will reset to 00h instead of FFh and the ports will be weakly pulled high. 5.8 Reset The RST pin of the AT89LP213/214 is active-low as compared with the active high reset in the standard 8051. In addition, the RST pin is sampled every clock cycle and must be held low for a minimum of two clock cycles, instead of 24 clock cycles, to be recognized as a valid reset. 6. Memory Organization The AT89LP213/214 uses a Harvard Architecture with separate address spaces for program and data memory. The program memory has a regular linear address space with support for up to 64K bytes of directly addressable application code. The data memory has 128 bytes of inter- nal RAM and 128 bytes of Special Function Register I/O space. The AT89LP213/214 does not support external data memory or external program memory. 6.1 Program Memory The AT89LP213/214 contains 2K bytes of on-chip In-System Programmable Flash memory for program storage. The Flash memory has an endurance of at least 10,000 write/erase cycles and a minimum data retention time of 10 years. The reset and interrupt vectors are located within the first 59 bytes of program memory (refer to Table 12-1 on page 20). Constant tables can be allo- cated within the entire 2K program memory address space for access by the MOVC instruction. The AT89LP213/214 does not support external program memory. Figure 6-1. Program Memory Map Program Memory 0000 07FF 0000 001F Atmel Signature Array 0040 007F User Signature Array |
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