Z86L81 Datasheet, PDF (9/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
3
General Description
Based on the Z8 MCU single-chip family of IR microcontrollers, the Z86L81/86/98
features 237 bytes of general-purpose RAM and 24/32/64 KB of ROM. The Maxim
CMOS microcontrollers offer fast executing, efficient use of memory, sophisticated
interrupts, input/output bit manipulation capabilities, automated pulse generation/
reception, and internal key-scan pull-up transistors.
The Z86L81/86/98 architecture is based on the Maxim 8-bit microcontroller core
with an Expanded Register File to allow access to register-mapped peripherals,
input/output (I/O) circuits, and powerful counter/timer circuitry. The Z8 offers a
flexible I/O scheme, an efficient register and address space structure, and a num-
ber of ancillary features that are useful in many consumer, automotive, computer
peripheral, and battery-operated hand-held applications.
There are three basic address spaces available to support a wide range of config-
urations: Program Memory, Register File, and Expanded Register File. The regis-
ter file is composed of 256 bytes of RAM. It includes 3 I/O port registers, 16
control and status registers, and 236 general-purpose registers. Register FEh
(SPH) can be used as a general-purpose register. The Expanded Register File
consists of two additional register groups (F and D).
To unburden the program from coping with such real-time problems as generating
complex waveforms or receiving and demodulating complex waveform/pulses, the
Z86L81/86/98 offers a new intelligent counter/timer architecture with 8-bit and
16-bit counter/timers (see Figure 1, Figure 2, Figure 3, and Table 3). Also included
are a large number of user-selectable modes, and two on-board comparators to
process analog signals with separate reference voltages (Figure 9 on page 20).
Power connections use the conventional descriptions listed in Table 2.
Table 2. Power Connections
Connection
Power
Ground
Circuit
V_CC
GND
Device
V_DD
V_SS
19-4615; Rev 0; 4/09