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IC89E64-12W Datasheet(PDF) 7 Page - Integrated Circuit Solution Inc |
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IC89E64-12W Datasheet(HTML) 7 Page - Integrated Circuit Solution Inc |
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7 / 36 page  IC89E54/58/64 Integrated CircuitSolution Inc. 7 MC012-0C 11/16/2001 Symbol PDIP PLCC PQFP I/O Name and Function PSEN 29 32 26 O Program Store Enable: The read strobe to external program memory. When the device is executing code from the external program memory, PSEN is activated twice each machine cycle except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. PSEN is an input control signal while memory program and verification. ALE/ PROG 30 33 27 I/O Address Latch Enable: Output pulse for latching the low byte of the address during an address to the external memory. In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. This pin is also the program pulse input ( PROG) during pro- grammable memory programming and erase. EA/VPP 31 35 29 I External access enable: EA must be externally held low to enable the device to fetch code from external program memory locations 0000H to FFFFH. If EA is held high, the device executes from internal program memory unless the program counter contains an address grater than 3FFFH/7FFFH re- specting to IC89C54/58 and the device always executes inter- nal program memory in IC89C64. This is also receives the 12 V programming enable voltage (Vpp) during Flash programming, when 12 V programming is selected. Vss 20 22 16 Ground: 0V reference. Vcc 40 44 38 I Power Supply: This is the power supply voltage for operation. Table 1. Detailed Pin Description (continued) OPERATING DESCRIPTION The detail description of the IC89E54/58/64 included in this description are: • Memory Map and Registers • Timer/Counters • Serial Interface • Interrupt System • Other Information • Flash Memory MEMORY MAP AND REGISTERS Program Memory and data memory Table 2 shows program memory and data memory size versus three products. The IC89E54/58/64 series includes a standard IC80C32 and a 16K/32K/64K Flash Memory. The IC89E54/58/64 includes IC80C32, a 16K/32K/64K Flash and some enhanced functions. The figures 3~5 show IC89E54/58/64 program memory architecture and program memory access status versus EA pin. These enhanced functions are described in later descriptions. The program memory and data memory access ranges are listed table 1. The AUX RAM status is disable after reset, so MOVX instructions will access external RAM. If set ENARAM bit, the AUX RAM will be enabled and MOVX instructions will access AUX RAM in 0000H~01FFH, access external RAM in 0200H~FFFFH. Figure 6 shows the external data memory and AUX RAM accesses relation. |
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