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W77C32P-25 Datasheet(PDF) 3 Page - Winbond |
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W77C32P-25 Datasheet(HTML) 3 Page - Winbond |
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3 / 71 page  Preliminary W77C32 Publication Release Date: March 1999 - 3 - Revision A1 PIN DESCRIPTION SYMBOL TYPE DESCRIPTIONS EA I EXTERNAL ACCESS ENABLE: It should be kept low. PSEN O PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the Port 0 address/data bus during fetch and MOVC operations. ALE O ADDRESS LATCH ENABLE: ALE is used to enable the address latch that separates the address from the data on Port 0. RST I RESET: A high on this pin for two machine cycles while the oscillator is running resets the device. XTAL1 I CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an external clock. XTAL2 O CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1. VSS I GROUND: Ground potential VDD I POWER SUPPLY: Supply voltage for operation. P0.0 −P0.7 I/O PORT 0: Port 0 is an open-drain bi-directional I/O port. This port also provides a multiplexed low order address/data bus during accesses to external memory. P1.0 −P1.7 I/O PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have alternate functions which are described below: T2(P1.0): Timer/Counter 2 external count input T2EX(P1.1): Timer/Counter 2 Reload/Capture/Direction control RXD1(P1.2): Serial port 1 RXD TXD1(P1.3): Serial port 1 TXD INT2(P1.4): External Interrupt 2 INT3 (P1.5): External Interrupt 3 INT4(P1.6): External Interrupt 4 INT5 (P1.7): External Interrupt 5 P2.0 −P2.7 I/O PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also provides the upper address bits for accesses to external memory. P3.0 −P3.7 I/O PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have alternate functions, which are described below: RXD(P3.0) : Serial Port 0 input TXD(P3.1) : Serial Port 0 output INT0 (P3.2) : External Interrupt 0 INT1 (P3.3) : External Interrupt 1 T0(P3.4) : Timer 0 External Input T1(P3.5) : Timer 1 External Input WR (P3.6) : External Data Memory Write Strobe RD (P3.7) : External Data Memory Read Strobe P4.0 −P4.3 I/O PORT 4: Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the alternate function WAIT which is the wait state control signal. * Note: TYPE I: input, O: output, I/O: bi-directional. |
Similar Part No. - W77C32P-25 |
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Similar Description - W77C32P-25 |
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