W78C438C_06 Datasheet, PDF (6/22 Pages) Winbond – 8-BIT MICROCONTROLLER

W78C438C
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.
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