Hd44850E - Hitachi AP1 Data Book

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