EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 69

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

eZ80
PS019209-0504
Features
New Instructions
®
CPU Core
The eZ80
software module or task under a real-time executive or operating system can
operate in Z80-compatible (64 KB) mode or full 24-bit (16 MB) address mode.
The CPU instruction set is a superset of the instruction sets for the Z80™ and
Z180™ CPUs. Z80 and Z180 programs can be executed on an eZ80
little or no modification.
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For more information on the CPU, its instruction set, and eZ80 programming,
please refer to the eZ80 CPU User Manual (UM0077), available on zilog.com.
Code-compatible with Z80 and Z180 products
24-bit linear address space
Single-cycle instruction fetch
Pipelined fetch, decode, and execute
Dual Stack Pointers for ADL (24-bit) and Z80 (16-bit) memory modes
24-bit CPU registers and ALU (Arithmetic Logic Unit)
Debug support
Nonmaskable Interrupt (NMI), plus support for 128 maskable vectored inter-
rupts
Loads/unloads the I register with a 16-bit value. These new instructions are:
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LD I,HL (ED C7)
LD HL,I (ED D7)
®
CPU is the first 8-bit CPU to support 16 MB linear addressing. Each
P R E L I M I N A R Y
Product Specification
eZ80F91 MCU
eZ80
®
CPU with
®
CPU Core
50