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TSC80251G2D-16CB Datenblatt(PDF) 8 Page - TEMIC Semiconductors |
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TSC80251G2D-16CB Datenblatt(HTML) 8 Page - TEMIC Semiconductors |
8 / 63 page 8 Rev. A - May 7, 1999 TSC80251G2D Note: 1. The description of A15:8/P2.7:0 and AD7:0/P0.7:0 are for the Non-Page mode chip configuration. If the chip is configured in Page mode operation, port 0 carries the lower address bits (A7:0) while port 2 carries the upper address bits (A15:8) and the data (D7:0). VSS GND Circuit Ground Connect this pin to ground. VSS1 GND Secondary Ground 1 This ground is provided to reduce ground bounce and improve power supply bypassing. Connection of this pin to ground is recommended. However, when using the TSC80251G2D as a pin-for-pin replacement for a 8xC51 product, VSS1 can be unconnected without loss of compatibility. Not available on DIP package. VSS2 GND Secondary Ground 2 This ground is provided to reduce ground bounce and improve power supply bypassing. Connection of this pin to ground is recommended. However, when using the TSC80251G2D as a pin-for-pin replacement for a 8xC51 product, VSS2 can be unconnected without loss of compatibility. Not available on DIP package. WAIT# I Real-time Synchronous Wait States Input The real-time WAIT# input is enabled by setting RTWE bit in WCON (S:A7h). During bus cycles, the external memory system can signal ‘system ready’ to the microcontroller in real time by controlling the WAIT# input signal. P1.6 WCLK O Wait Clock Output The real-time WCLK output is enabled by setting RTWCE bit in WCON (S:A7h). When enabled, the WCLK output produces a square wave signal with a period of one half the oscillator frequency. P1.7 WR# O Write Write signal output to external memory. P3.6 XTAL1 I Input to the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, its output is connected to this pin. XTAL1 is the clock source for internal timing. XTAL2 O Output of the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, leave XTAL2 unconnected. Signal Name Type Description Alternate Function |
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