Z87100

` 3.0V to 5.5V Operating Range
` On-Chip PN Modulator for Spread Spectrum Communications
` ROM-Programmable PN Codes, up to 256 Bits ("Chips")
` Fast Instruction Pointer - 1.0 ms @ 12 MHz
` Two Standby Modes - STOP and HALT
` 12 Input/Output Lines (One with Comparator Input)
` Two Programmable 8-Bit Counter/Timers
` 6-Bit Programmable Prescaler
` Six Vectored, Priority Interrupts (Two External, One Software Generated)
` Maximum Clock Speed of 12 MHzn Watch-Dog/Power-On Reset Timer
` Analog Comparator with Programmable Interrupt Polarity
` On-Chip Oscillator that Accepts a RC, or External Clock Drive
` Low EMI Noise Mode
` 0° to +70 Ultra-Low Power Operation at 10 kHz

The Z87100 Wireless Controller is a member of the Z8^® single-chip microcontroller family and is manufactured in CMOS technology. Zilog's CMOS Z87100 microcontroller offers fast execution, efficient use of memory, sophisticated interrupts, input/output bit manipulation capabilities, and easy hardware/software system expansion along with low cost and low power consumption.

The Z87100 architecture is based on Zilog's 8-bit microcontroller core with the addition of an Expanded Register File which allows access to register mapped peripheral and I/O circuits. The Z87100 offers a flexible I/O scheme and a number of ancillary features that are useful in many consumer, industrial, automotive, and advanced scientific applications.

The Z87100 is designed with specific features for wireless spread spectrum applications using direct sequence pseudo- noise (PN) modulation. With up to 256 bits ("chips") of specially designated "PN ROM", one or more PN code sequences may be stored and used to PN-modulate data generated by the Z87100. PN modulation is synchronous with the data, using an integer number of PN chips per data bit.

The Z87100 features an Internal Time Base Counter which provides a real time clock for Stop-Mode Recovery or interrupt at programmable intervals of 0.25 seconds, one second, one minute and one hour. This requires an external clock oscillator signal at 32.768 kHz.

Special PN modulator control registers allow the user to select the desired PN modulator outputs, to choose the PN clock source and PN sequence start address in PN ROM, to stop/start and enable/disable the PN modulator, and to determine whether a complete PN code sequence is modulated against a single bit or an integer fraction or multiple of a single bit. The PN-modulated data may then be used with an external modulator and RF section to form a complete wireless spread spectrum transmitter.

The device's many applications demand powerful I/O capabilities.The Wireless Controller fulfills this with 12 pins dedicated to input and output. These lines are grouped into two ports, and are configurable under software control to provide timing, status signals, or parallel I/O.

Three basic address spaces are available to support this wide range of configurations; Program Memory, Register File, and Expanded Register File. The Register File is composed of 124 bytes of General-Purpose Registers, two I/O Port registers and fifteen Control and Status registers. The Expanded Register File consists of two port registers, four control registers and six PN modulator registers.

With powerful peripheral features such as on-board comparators, counter/timers, Watch-Dog Timer, and PN modulator, the Z87100 meets the needs for most sophisticated wireless and low-power controller applications (Figure 1).