Z87C33 Datasheet, PDF (11/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
5
Pin Functions
The following pages describe the function of each available Z87C33 family pin.
X_IN Crystal Input. This pin connects a parallel-resonant crystal, ceramic resonator,
LC, or RC network, or an external single-phase clock to the on-chip oscillator
input.
X_OUT Crystal Output. This pin connects a parallel-resonant crystal, ceramic reso-
nant, LC, or RC network to the on-chip oscillator output.
Port 0 (P00–P07). Port 0 is an 8-bit, bidirectional, CMOS-compatible port. These
eight I/O lines are configured under software control as a nibble I/O port (P03–P00
input/output and P07–P04 input/output), or as an address port for interfacing
external memory. The input buffers are Schmitt-triggered and nibble-programmed
as outputs and can be globally programmed as either push-pull or open-drain.
Low-EMI output buffers are globally programmed by the software.
PS015601-1003