Z86C72

`  Expanded Register File Control Registers 
`  Low Power Consumption - 40 mW (typical) 
`  Three Standby Modes:
  STOP
  HALT
  Low Voltage
`  Automatic External ROM Access Beyond 16K (Z86LX2/C72 Version)
`  Special Architecture to Automate Both Generation and Reception of Complex Pulses or Signals:
  One Programmable 8-Bit Counter/Timer with Two Capture Register
  One Programmable 16-Bit Counter/Timer with One Capture Register
  Programmable Input Glitch Filter for Pulse Reception
`  Five Priority Interrupts
  Three External
  Two Assigned to Counter/Timers
`  Low Voltage Detection and Standby Mode
`  Programmable Watch-Dog/Power-On Reset Circuits
`  Two Independent Comparators with Programmable Interrupt Polarity
`  On-Chip Oscillator that Accepts a Crystal, Ceramic Resonator, LC, RC (mask option), or External Clock Drive
`  Mask Selectable 200 kOhms Pull-Ups on Ports 0, 2, 3
  All Eight Port 2 Bits at one time or Not
  Pull-Ups Automatically Disabled Upon Selecting Individual Pins as Outputs
`  Maskable Mouse/Trackball Interface on P00 Through P03 is available on the L72 version.
`  32 kHz Oscillator Mask Option

Notes:
* Voltage on all pins with respect to GND
† See Ordering Information Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device.

This is a stress rating only; operation of the device at any condition above those indicated in the operational sections of these specifications is not implied. Exposure to absolute maximum rating conditions for an extended period may affect device reliability.

The Z86LX2/CX2 family of IR (Infrared) Z86C72 are ROM/ROMless-based members of the Z8® MCU single-chip microcontroller family with 768 bytes of internal RAM. The differentiating factor between these devices is the availability of RAM, ROM and package options. The use of external memory enables these Z8 microcontrollers to be used where code flexibility is required. Offering the 5V versions (Z86CXX) and gives optimum performance in both the low and high voltage ranges. Zilog's CMOS microcontrollers offer fast execution, efficient use of memory, sophisticated interrupts, input/output bit manipulation capabilities, automated pulse generation/reception, and internal key-scan pull-up resistors. The Z86LX2/CX2 product line offers easy hardware/software system expansion with cost-effective and low power consumption.

The Z86LX2/CX2 Z86C72 architecture is based on Zilog's 8-bit microcontroller core with an Expanded Register File to allow access to register mapped peripherals, I/O circuits, and powerful counter/timer circuitry. The Z86C72/C92/L72/L92 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.

Many applications demand powerful I/O capabilities. The Z86LX2/CX2 Z86C72 family fulfills this with three package options in which the L72 version provides 31 pins of dedicated input and output. These lines are grouped into four ports.

Each port consists of eight lines (Port 3 has seven lines) and is configurable under software control to provide timing, status signals, parallel I/O with or without handshake, and an address/data bus for interfacing external memory.

There are five basic address spaces available to support a wide range of configurations: Program Memory, Register File, Expanded Register File, Extended Data RAM and External Memory. The register file is composed of 256 bytes of RAM. It includes four I/O port registers, 16 control and status registers and the rest are General-Purpose registers.

The Extended Data RAM adds 512 bytes of usable general-purpose registers. 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 Z86LX2/CX2 family 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 (Figure 2).