Z86D86 Datasheet, PDF (20/80 Pages) Zilog, Inc. – 28-Pin Low-Voltage OTP Microcontroller

Z86D86
28-Pin Low-Voltage OTP Microcontroller
12
Pin Functions (Standard Mode)
XTAL1 Crystal 1 (Time-Based Input)
This pin connects a parallel-resonant crystal, ceramic resonator, LC, or RC net-
work to the on-chip oscillator input. An external single-phase clock to the on-chip
oscillator input is also an option.
XTAL2 Crystal 2 (Time-Based Output)
This pin connects a parallel-resonant crystal, ceramic resonant, LC, or RC net-
work to the on-chip oscillator output.
Port 0 (P07–P00)
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. The output drivers are
push-pull or open drain controlled by bit D2 in the PCON register.
If one or both nibbles are required for I/O operation, they must be configured by
writing to the Port 0 mode register. After a hardware reset, Port 0 is configured as
an input port.
An EPROM option is available to program 0.4 V_CC CMOS trip inputs on P00–P03.
This allows direct interface to mouse/trackball IR sensors.
An optional 200 ±50%KΩs pull-up transistor is available as a mask option on all
Port 0 bits with nibble select. See Figure 6.
Note: ^{Internal pull-ups are disabled on any given pin or group of port}
pins when programmed into output mode.
PS008905-0105
PRELIMINARY