Z86L825 Datasheet, PDF (9/79 Pages) Zilog, Inc. – 20-Pin Low-Voltage IR Microcontrollers

Z86L825/826/827
20-Pin Low-Voltage IR Microcontrollers
2
• Mask selectable 200±50% KΩ transistor pull-ups on Ports 2 and 3. Port 0
always has pull-up selected.
– Programmable mask options:
– Oscillator selection: RC oscillator versus crystal or other clock source
– Oscillator operational mode: normal high-frequency operation enabled or
32-KHz operation enabled
– Port 2: 0–7 pull-ups
– Port 3: pull-ups
– Port 0: 0–3 Mouse Mode: Normal Mode(.5V_DD input threshold) versus
Mouse Mode (.4V_DD input threshold)
General Description
The Z86L825/826/827 are ROM-based members of the Z8 MCU single-chip fam-
ily of IR (infrared) with 237 bytes of general-purpose RAM and 4 KB of ROM.
ZiLOG’s 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 Z86L825 architecture is based on ZiLOG's 8-bit microcontroller core with an
Expanded Register File to allow access to register mapped peripherals, I/O cir-
cuits, and powerful counter/timer circuitry. The Z8 offers a flexible I/O scheme, an
efficient register and address space structure, and a number of ancillary features
that are useful in many consumer, automotive, computer peripheral, and battery
operated hand-held applications.
The register file consists of 256 bytes of RAM. It includes three I/O port registers,
16 control and status registers and the rest are General Purpose registers. Regis-
ter FEh (SPH) can be used as general purpose register. The Expanded Register
File consists of two additional register groups (F and D).
The Z86L825 offers a new intelligent counter/timer architecture with 8-bit and 16-
bit counter/timers (Figure 1). Also included are a large number of user-selectable
modes, and two on-board comparators to process analog signals with separate
reference voltages.
PS008808-1203
PRELIMINARY