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HPC-DEV-SUNC Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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HPC-DEV-SUNC Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 30 page  Pin Descriptions IO PORTS Port A is a 16-bit multiplexed addressdata bus used for accessing external program and data memory Four associ- ated bus control signals are available on port B The Ad- dress Latch Enable (ALE) signal is used to provide timing to demultiplex the bus Reading from and writing to external memory are signalled by RD and WR respectively External memory can be addressed as either bytes or words with the decoding controlled by two lines Bus High Byte enable (HBE) and AddressData Line 0 (A0) Port B is a 16-bit port with 12 bits of bidirectional IO Pins B10 B11 B12 and B15 are the control bus signals for the addressdata bus Port B may also be configured via a func- tion register BFUN to individually allow each bidirectional IO pin to have an alternate function B0 TDX UART Data Output B1 CFLG1 Closing Flag Output for HDLC 1 Transmitter B2 CKX UART Clock (Input or Output) B3 T2IO Timer2 IO Pin B4 T3IO Timer3 IO Pin B5 SO MICROWIREPLUS Output B6 SK MICROWIREPLUS Clock (Input or Output) B7 HLDA Hold Acknowledge Output B8 TS0 Timer Synchronous Output B9 TS1 Timer Synchronous Output B10 ALE Address Latch Enable Output for AddressData Bus B11 WR AddressData Bus Write Output B12 HBE High Byte Enable Output for Address Data Bus also 8-Bit Mode Strap Input on Reset B13 TS2 Timer Synchronous Output B14 TS3 Timer Synchronous Output B15 RD AddressData Bus Read Output When operating in the extended memory addressing mode four bits of port B can be used as follows B8 BS0 Memory bank switch output 0 (LSB) B9 BS1 Memory bank switch output 1 B13 BS2 Memory bank switch output 2 B14 BS3 Memory bank switch output 3 (MSB) Port I is an 8-bit input port that can be read as general purpose inputs and can also be used for the following func- tions I0 HCK2 HLDC 2 Clock Input I1 NMI Nonmaskable Interrupt Input I2 INT2 Maskable InterruptInput Capture I3 INT3 Maskable InterruptInput Capture I4 INT4RDY Maskable InterruptInput Capture Ready Input I5 SI MICROWIREPLUS Data Input I6 RDX UART Data Input I7 HCK1 HDLC 1 Clock and Serial Decoder Clock Input Port D is an 8-bit input port that can be read as general purpose inputs and can also be used for the following func- tions D0 REN1FS Receiver 1 EnableSerial Decoder RHCK1 Frame Sync InputReceiver 1 Clock Input D1 TEN1 Transmitter 1 Enable Input D2 REN2 Receiver 2 Enable InputReceiver RHCK2 2 Clock Input D3 TEN2 Transmitter 2 Enable Input D4 RX1 Receiver 1 Data Input D5 TX1 Transmitter 1 Data Output D6 RX2 Receiver 2 Data Input D7 TX2 Transmitter 2 Data Output Note Any of these pins can be read by software Therefore unused func- tions can be used as general purpose inputs notably external enable lines when the internal serial decoder is used Port R is an 8-bit bidirectional IO port available for general purpose IO operations Port R has a direction register to enable each separate pin to be individually defined as an input or output It has a data register which contains the value to be output In addition the Port R pins can be read directly using the Port R pins address 10 |
Similar Part No. - HPC-DEV-SUNC |
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Similar Description - HPC-DEV-SUNC |
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