Z86C21 Datasheet | Zilog.

WITH 8K ROM Z86C21 MCU P RODUCT S PECIFICA TION 8K ROM Z8® CMOS MICROCONTROLLER Features s s 8-Bit CMOS MCU with 8 Kbytes of ROM 256 Byte Register File - 236 Bytes of General-Purpose RAM - 16 Bytes Control/Status Registers - 4 Bytes for Ports 40-Pin DIP, 44-Pin PLCC or 44-Pin QFP Package s s s s Full-Duplex UART All Digital Inputs are TTL Levels Auto Latches RAM and ROM Protect Two Programmable 8-Bit Counter/Timers each with 6-Bit Programmable Prescaler. Six Vectored, Priority Interrupts from Eight Different Sources Clock Speeds: 12 and 16 MHz On-Chip Oscillator that Accepts a Crystal, Ceramic Resonator, LC, or External Clock Drive. s s s s s s s 4.5V to 5.5V Operating Range Low Power Consumption: 220 m W (max) @ 16 MHz Fast instruction pointer: 1.0 µs @ 12 MHz s s Two Standby Modes: STOP and HALT s 32 Input/Output Lines GENERAL DESCRIPTION The Z86C21 microcontroller is a member of the Z8 singlechip microcontroller family with 8 Kbytes of ROM and 236 bytes of RAM. The device is packaged in a 40-pin DIP, 44-pin PLCC, or a 44-pin QFP with a ROMless pin option available on the 44-pin versions only. With the ROM/ ROMless feature selectively, the Z86C21 offers both external memory and preprogrammed ROM, making it wellsuited for high-volume applications or where code flexibility is required. Zilog’s CMOS 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 Z86C21 architecture is characterized by Zilog’s 8-bit microcontroller core. The device offers a flexible I/O scheme, an efficient register and address space structure, multiplexed capabilities between address/data, I/O, and a number of ancillary Features that are useful in many industrial and advanced scientific applications. For applications demanding powerful I/O capabilities, the Z86C21 provides 32 pins dedicated to input...