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HMCS44C,HMCS44CL------------------------------------------------------
• ELECTRICAL CHARACTERISTICS-2 (Ta
= -
20 to
+
7 5
"C)
Reset and Halt
Item
Symbol
Halt Duration Voltage
VOH
Halt Current
IOH
Halt Delay Time
tHD
Operation Recovery Time
tRC
RITFall Time
tfHLT
Ff[T
Rise Time
trHLT
RIT "Low" Hold Time
tHLT
RlT
"High" Hold Time
tOPR
RESET Pulse Width (1)
tRsn
RESET Pulse Width (2)
tRST2
RESET Fall Time
tfRST
RESET Rise Time
trRST
[NOTE) All voltages are with respect to GND.
• SIGNAL DESCRIPTION
The input and output signals for the HMCS44C, shown in
PIN ARRANGEMENT, are described in the following para-
graphs.
• Vcc and GND.
. ,
Power is supplied to the HMCS44C usmg these two pms. Vee
is
power and GND is the ground connection.
• RESET
This pin allows resetting of the HMCS44C at times other than
the automatic resetting capability (ACL; Built-in Reset Circuit)
already in the HMCS44C,
The HMCS44C can be reset by pulling RESET high. Refer to
RESET FUNCTION for additional information.
• OSC, and OSC
2
These pins provide control input for the built-in oscillator cir-
cuit. Resistor and capacitor , ceramic filter circuit, or an external
oscillator can be connecteG to these pins to provide a system
clock with various degrees of stability/cost tradeoffs.
Lead length and stray capacitance on these two pins should be
minimized. Refer to OSCILLATOR for recommendations about
these pins.
• HLT
This pin
is
used to place the HMCS44C in the Halt State.
Refer to HALT FUNCTION for details of the Halt Mode.
• TEST
This pin is not for user application and must be connected to
Vee·
Value
Unit
Test Conditions
min.
max.
HLT=0.2V
2.0
V
Vin=Vcc, RIT=0.1V
10
/-I
A
-
VOH=2.0V
200
-
/-IS
200
/-Is
-
1000
/-Is
-
1000
/-IS
800
/-IS
Rf Oscillation, External
Clock Operation
0.2
-
ms
Vcc= 2.5 to 5.5V
External Reset.
Vcc=2.5 to 5.5V, RIT=Vcc
2
-
(Rf Oscillation, External
ms
Clock Operation)
External Reset.
2·
Vcc= 2.5 to 5.5V
-
/-IS
HLT=V cc
Tinsl
HLi=vcc
-
20
ms
HLT=Vc c
-
20
ms
44
• INTo and INT,
.
These pins provide the capability for asynchronously applymg
external interrupts to the HMCS44C.
Refer to INTERRUPTS for additional information.
• Roo
to
R o3 ' R,o
to
R'3' R 20
to
R 23 , R30
to
R33
These 16 lines are arranged into four 4-bit Data Input/Output
Common Channels.
The 4-bit registers (Data I/O Register) are attached to these
channels. Each channel is directly addressed by the operand of
input/output instruction. Refer to INPUT/OUTPUT for addi-
tional information.
• D o toD'5
These lines are 16 I-bit Discrete Input/Output Common Pins.
The I-bit latches are attached to these pins. Each pin is addressed
by the Y register. The Do to 0
3
pins are also addressed directly
by the operand of input/output instruction. Refer to INPUT/
OUTPUT for additional information.
• ROM
• ROM Address Space
ROM is used as a memory for the instructions and the pat-
terns (constants). The instruction used in the HMCS44C consists
of 10 bits. These 10 bits are called "a word", which is a unit for
writing into ROM.
The ROM address is composed of the program area (0 page
to 31 page) and the pattern area (61, 62 page) (64 words/page).
The ROM capacity is 2,176 words
(1
word
=
10 bits) in all.
Only the program area can contain both the instructions and
the patterns (constants).
The ROM address space is shown in Figure 1.
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