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ZPSD301 数据表(PDF) 32 Page - STMicroelectronics |
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ZPSD301 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 85 page  PSD3XX Family 29 14.0 System Applications (cont.) In Figure 13, the PSD3XX is configured to work directly with Intel’s 80C196KB microcontroller, which is a 16-bit address/16-bit data bus processor. The Address and data lines multiplexed. The PSD3XX is configured to use PC0, PC1, PC2, and A19/CSI as logic inputs. These signals are independent of the ALE pulse (latch-transparent). They are used as four general-purpose inputs that take part in the PAD equations. Port A is configured to work in Track Mode, in which (for certain conditions) PA0–PA7 tracks lines AD0/A0–AD7/A7. Port B is configured to generate CS0–CS7. In this example, PB2 serves as a WAIT signal that slows down the 80C196KB during the access of external peripherals. These 8-bit wide peripherals are connected to the shared bus of Port A. The WAIT signal also drives the buswidth input of the microcontroller, so that every external peripheral cycle becomes an 8-bit data bus cycle. PB3 and PB4 are open-drain output signals; thus, they are pulled up externally. 67 68 36 NMI RxD TxD +5V RST 66 XTAL1 AD[0 ..15] AD[0 ..15] XTAL2 3 43 64 14 16 NMI READY BUSWIDTH CDE RESET 6 5 7 4 11 10 8 9 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 18 17 15 44 42 39 33 38 P2.0/TXD P2.1/RXD P2.2/EXINT P2.3/T2CLK P2.4/T2RST P2.5/PWM P2.6/ T2 UP/DN P2.7/ T2 CAPTR AD0/A0 AD1/A1 AD2/A2 AD3/A3 AD4/A4 AD5/A5 AD6/A6 AD7/A7 AD8/A8 AD9/A9 AD10/A10 AD11/A11 AD12/A12 AD13/A13 AD14/A14 AD15/A15 21 20 19 18 17 16 15 14 11 10 9 8 7 6 5 4 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 AD0/A0 AD1/A1 AD2/A2 AD3/A3 AD4/A4 AD5/A5 AD6/A6 AD7/A7 AD8/A8 AD9/A9 AD10/A10 AD11/A11 AD12/A12 AD13/A13 AD14/A14 AD15/A15 AD0/A0 AD1/A1 AD2/A2 AD3/A3 AD4/A4 AD5/A5 AD6/A6 AD7/A7 AD8/A8 AD9/A9 AD10/A10 AD11/A11 AD12/A12 AD13/A13 AD14/A14 AD15/A15 23 24 25 26 27 28 29 30 31 32 33 35 36 37 38 39 40 41 42 43 1 2 22 13 3 PC0 PC1 PC2 A19/CSI BHE /PSEN WR/VPP RD ALE RESET 24 25 26 27 HSI.0 HSI.1 HSI.2/HSO.4 HSI.3/HSO.5 13 37 12 2 VREF VPP ANGND EA 19 20 21 22 23 30 31 32 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 65 41 40 61 62 63 28 29 34 35 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P3.0/AD0 P3.1/AD1 P3.2/AD2 P3.3/AD3 P3.4/AD4 P3.5/AD5 P3.6/AD6 P3.7/AD7 P4.0/AD8 P4.1/AD9 P4.2/AD10 P4.3/AD11 P4.4/AD12 P4.5/AD13 P4.6/AD14 P4.7/AD15 CLKOUT BHE / WRH WR / WRL RD ALE /ADV INST HSO.0 HSO.1 HSO.2 HSO.3 0.1µF 0.1µF FOUR GENERAL PURPOSE INPUTS GND GND 12 34 +5V +5V +5V 4.7K Ω 4.7K Ω 0.1µF ALE WAIT SHARED BUS PORT 1 I/O PINS 44 VCC VCC VSS VSS ADDRESS/DATA MULTIPLEXED BUS 80C196KB PSD3XX Figure 13. PSD3XX Interface With Intel’s 80C196KB |
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