HD44850E---------------
The HD44850E
is
an evaluation chip for 4-bit single-chip
microcomputer, HMCS40 series. Its function
is
equivalent to
HMCS45C except that
it
doesn't contain ROM. Instead, it has
the function to address external memory (ROM or RAM). User
can handle this evaluation chip
by
writing program into external
program memory as
well
as the HMCS40 series chip
in
which
program has been written. User program and system can be
debugged
by
connecting this evaluation chip with external pro-
gram memory
in
which user program
is
written to user systems.
The HD44850E provides 12-bit address outputs
(Ao
to All
terminals) and 10-bit instruction input pins
(0
1
to
010
terminals)
for the external program memory.
~
and TSTP pins are required
for debugging programs, and H43,
CMOS
and DIE pins
for
selecting applicable chips.
• APPLICABLE CHIPS
HMCS42C.43C.44C.45C
• FUNCTION
• Instruction
Characteristics etc.; Same
as
the HMCS45C
•
Address Extemal
ROM
(2k)
• Address Output; Direct interface
with
EPROM
(Ao
to
A,,)
• Instruction Input;
EPROM
or
CMOS RAM
or
NMOS RAM
(0,
to
0,01
Direct interface
with
TTL
• CMOS/PMOS Selecting Input Pin
• Timer Halt Input
•
I/O
Enable/Disable Selecting
Pin
at Halt
•
Output Pins except Address Output and Clock Open Drain
Output
• Address Output. Clock; CMOS Output
• Input Pins; Inputs
with
no Pull up MOS
HD44S50E
(FC-SO)
• PIN ARRANGEMENT
....
0
....
0
I')
~~oooocoo««~««~~
HD44850E
(Top View)
• PIN
NAME
Ao
to
A"
: Address Output
0,
to
0'0
: Instruction Input
~
:
Word
Timing
TSTP : Timer Stop Input
H43
:
HMCS43/45A
Selection
CMOS
: CMOS/PMOS Selection
D/E : I/O Enable/Disable Selection Input in the
~'~It
Roo
to
R53
Reo
to
Re3
Do
to
0'5
OSC,.OSC
2
INTo.INT,
RESET
R[T
Vee
GND
292
Mode
:
I/O Common Port
: Output Port
:
I/O Common Port
: Oscillator
:
Interrupt
: External Reset
:
Halt
Pin
: Power SupplV
: Ground
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