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IT80C154-16 Datasheet(PDF) 5 Page - TEMIC Semiconductors |
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IT80C154-16 Datasheet(HTML) 5 Page - TEMIC Semiconductors |
5 / 24 page 80C154/83C154 Rev.F (14 Jan. 97) 5 MATRA MHS ALE Address Latch Enable output for latching the low byte of the address during accesses to external memory. ALE is activated as though for this purpose at a constant rate of 1/6 the oscillator frequency except during an external data memory access at which time one ALE pulse is skipped. ALE can sink or source 8 LS TTL inputs. It can drive CMOS inputs without an external pullup. PSEN Program Store Enable output is the read strobe to external Program Memory. PSEN is activated twice each machine cycle during fetches from external Program Memory. (However, when executing out of external Program Memory, two activations of PSEN are skipped during each access to external Data Memory). PSEN is not activated during fetches from internal Program Memory. PSEN can sink/source 8 LS TTL inputs. It can drive CMOS inputs without an external pullup. EA When EA is held high, the CPU executed out of internal Program Memory (unless the Program Counter exceeds 3FFFH). When EA is held low, the CPU executes only out of external Program Memory. EA must not be floated. XTAL1 Input to the inverting amplifier that forms the oscillator. Receives the external oscillator signal when an external oscillator is used. XTAL2 Output of the inverting amplifier that forms the oscillator, and input to the internal clock generator. This pin should be floated when an external oscillator is used. Idle and Power Down Operation Figure 3 shows the internal Idle and Power Down clock configuration. As illustrated, Power Down operation stops the oscillator. The interrupt, serial port, and timer blocks continue to function only with external clock (INT0, INT1, T0, T1). Figure 3. Idle and Power Down Hardware. Idle Mode operation allows the interrupt, serial port, and timer blocks to continue to function with internal or external clocks, while the clock to CPU is gated off. The special modes are activated by software via the Special Function Register, PCON. Its hardware address is 87H. PCON is not bit addressable. |
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