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W78C438C Datasheet(PDF) 5 Page - Winbond |
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W78C438C Datasheet(HTML) 5 Page - Winbond |
5 / 16 page W78C438C Publication Release Date: July 1998 - 5 - Revision A1 P8.0 −P8.7 I/O Port Functions are the same as those of Port 1 in the W78C31, except that they are mapped by the P8 register and not bit-addressable. The P8 register is not a standard register in the W78C32. Its address is at 0A6H. INT2 , INT3 External Interrupt, Input Functions are similar to those of external INT0 , INT1 in the W78C32, except that the functions/status of these interrupts are determined/shown by the bits in the XICON (External Interrupt Control) register. The XICON register is bit-addressable but is not a standard register in the W78C32. Its address is at 0C0H. For details, see the Functional Description below. EA External Address, Input Functions same as W78C32. RST, XTAL1, XTAL2, PSEN , ALE Functions same as W78C32. BLOCK DIAGRAM SFR RAM 256 Bytes CPU Serial Port Data Bus CORE Interrupt INT0 Timer0 Timer2 Port 0 Port 1 Port 2 Alternate Port 8 DP4 AP5 AP6 AP7 Alternate INT1 Timer1 INT2 INT3 Port 3 Alternate |
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