8-bit microcontroller, eZ80AcclaimPlus!, LQFP-144

The eZ80F91 device from Zilog is a member of the eZ80Acclaim! family from Zilog. Flash Application-Specific Standard Products (ASSPs). The eZ80F91 MCU is a high-speed ASP with a maximum clock speed of 50 MHz and single-cycle instruction fetch. It operates in Z80-compatible addressing mode (64 KB) or in full 24-bit addressing mode (16 MB). The eZ80F91's extensive peripherals make it suitable for a wide range of applications, including industrial control, embedded communications and point-of-sale terminals.

Features
- High performance eZ80 CPU core with single cycle instruction fetching and pipelining
- 10/100 BaseT Ethernet media access controller with media independent interface
(MII)
- 256 KB flash memory
- 16 KB SRAM (8 KB user and 8 KB Ethernet)
- Power-saving functions such as SLEEP mode, HALT mode and selective peripherals
Shutdown control
- Two Universal Asynchronous Receiver/Transmitters (UART) with independent baud rate generators
Rate generators (BRG)
- Serial peripheral interface (SPI) with independent clock generator
- I2C with independent clock generator
- IrDA-compatible infrared encoder/decoder
- Glueless external peripheral interface with 4 chip selects, individual wait state generators,
an external WAIT input pin; supports Z80-, Intel- and Motorola-like buses
- Vectored interrupts with fixed priority (both internal and external) and interrupt controller
- Real-time clock with separate VDD pin for battery backup and selectable on-chip
32 kHz oscillator or external 50/60 Hz input
- Four 16-bit counters/timers with prescalers and direct control of the inputs/outputs
- Watchdog timer with internal oscillator clocking as an option
- 32-bit general purpose inputs/outputs (GPIO)
- On-chip instrumentation (OCI™) and Zilog debug interfaces (ZDI)
- IEEE 1149.1-compatible JTAG interface