Z86L81 Datasheet, PDF (21/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
15
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 (see Figure 6). 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 writ-
ing to the Port 0 mode register. After a hardware reset, Port 0 is configured as an
input port.
A mask option is available to program 0.4 V_DD CMOS trip inputs on P00–P03.
This option allows direct interface to mouse/trackball IR sensors.
An optional pull-up transistor is available as a mask option on all Port 0 bits with
nibble select.
Note: Internal pull-ups are disabled on any given pin or group of port
pins when programmed into output mode.
19-4615; Rev 0; 4/09