Z86319 Datasheet | Zilog

FEATURES Device Z86319 ROM (KB) 2 RAM- (Bytes) 125 I/O Lines 13 Voltage Range 4.5V to 5.5V s 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 s s Note: - General-Purpose (144K Total RAM) s s 0°C to + 40°C Operating Temperature Range Low-Power Consumption: 25 m W (Typical) s s s 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 acmodate opto-transistor outputs, and high drive ports capable of up to 10 m A 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 munications for increased system efficiency. DS97KEY1605 PRELIMINARY Z86319 PS/2 Mouse Controller Zilog GENERAL DESCRIPTION (Continued) Input AGND...