April 1, 1993 RM Hitachi H8/300h
Controller family ups high end with 32-bit ALU
H8/3003 chip executes all H8300 family code without modification, adds
16-bit bus, 24-bit address, and long-word data type
The H8/3003 is the first of the H8/300H series of microcontrollers, an
architectural extension of the company's H8/300 series. The series' linear
address range jumps from 16 to 24 bits, and it adds 16 extension
registers. A 32-bit ALU and direct support for a 32-bit long-word data
type fill out the basic architecture. The 3003 implements the
architecture with a great deal of pin sharing, squeezing everything
possible from a relatively inexpensive 112-pin plastic quad flatpack (see
diagram). For example, Port 5 yields the four high-address lines, and some
lines in port A have four possible uses. In addition to a dedicated NMI
pin, eight external interrupts share port pins. If the added 8 bits are
not needed on the external data bus, another 8-bit port becomes available.
Hitachi has paid Cygnus Support (Mountain View, CA) to port the Free
Software Foundation's GNU high-level language tools to the H8 family, and
distributes the tools free for use with PCs. The tools are available from
Cygnus for Unix hosts. (ROMless version with 512 bytes RAM, 12.50 ea/5,
000–samples now.) Hitachi America, Ltd. Brisbane, CA Literature
Package M2P034 800-285-1601, ext. 21
CAPTION:
The 112 pins of the H8/3003 are mostly available for two or three uses,
depending on configuration.
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