Document
PRELIMINARY PRODUCT SPECIFICATION
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Z86319
PS/2 MOUSE CONTROLLER
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Device Z86319
ROM (KB) 2
RAM* (Bytes) 125
I/O Lines 13
Voltage Range 4.5V to 5.5V
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P24-P27 Can Be Configured with a Voltage Divider During Input Mode On-Chip Oscillator (Tolerance = ±10%) Fast Instruction Pointer: 1.5 µs @ 4 MHz ESD Protection Circuitry Hardwired Watch-Dog Timer (WDT) Excellent System Level EMI/EFT/ESD
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Note: *General-Purpose (144K Total RAM) s s
0°C to + 40°C Operating Temperature Range Low-Power Consumption: 25 mW (Typical)
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GENERAL DESCRIPTION
The Z86319 is a member of the Z8 family of CMOS microcontrollers architecture to be used in mouse applications. These devices offer on-board pull-up and pull-down resistors, a trip-point buffer to accommodate opto-transistor outputs, and high drive ports capable of up to 10 mA current sinking per pin (3 pins maximum). A permanently enabled Watch-Dog Timer ensures operational reliability across a broad range of mouse application environments. The precision RC oscillator filters out highfrequency noise from the oscillator input pin. When configured as inputs, P24-P27 have built in voltage dividers (25K pull-up /7.5K pull-down). The input levels are designed for connection to the emitters of the opto-transistors and switch at a voltage level of 0.4 VDD. For applications requiring powerful I/O capabilities, the Z86319 provides dedicated input and output lines that are grouped into three ports. There are two basic address spaces available to support this configuration: Program Memory, and 125 bytes of general-purpose registers. The Z86319 device provides two on-chip 8-bit programmable counter/timers with a large number of user-selectable modes. Each counter/timer is driven by its own 6-bit programmable prescaler. The Z86319 counter/timers off-load system real-time tasks such as counting/timing and input/output data communications for increased system efficiency.
DS97KEY1605
PRELIMINARY
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Z86319 PS/2 Mouse Controller
Zilog
GENERAL DESCRIPTION (Continued)
Input
VDD
GND
AGND
RCIN
Port 3
Machine Timing & Inst. Control
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ALU Counter/ Timers (2) Prg. Memory 2048 x 8-Bit
FLAG
Interrupt Control
Register Pointer Register File 144 x 8-Bit
Program Counter
Port 2
Port 0
WDT
I/O (Bit Programmable)
I/O
Figure 1. Z86319 Functional Block Diagram
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PRELIMINARY
DS97KEY1605
Zilog
Z86319 PS/2 Mouse Controller
PIN DESCRIPTIONS
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P24 P25 P26 P27 VDD RCIN AGND P31 GND 1 18
18 - Pin DIP/SOIC
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10
P23 P22 P21 P20 GND P02 P01 P00 P33
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Figure 2. 18-Pin DIP/SOIC Pin Configuration Table 1. 18-Pin DIP/SOIC Pin Identification Pin # 1-4 5 6 7 8 9 10 11-13 14 15-18 Symbol P24-P27 VDD RCIN AGND P31 GND P33 P00-P02 GND P20-P23 Function Port 2, Pins 4,5,6,7 Power Supply RC Oscillator Analog Ground Port 3, Pin 1 Ground Port 3, Pin 3, Port 0, Pins 0,1,2 Ground Port 2, Pins 0,1,2,3 Direction In/Output Powe.