Hitachi AP1 - Page 90

HMCS46C,HMCS46CL------------------------------------------------------
• ELECTRICAL CHARACTERISTICS-2 (Ta - -20 to +75°C)
R ... tand Halt
Value
Unit
Item
Symbol
Test Conditions
min. max.
Halt Duration Voltage
VOH
HLT= 0.2V
2.0
-
V
Halt Current
IOH
~Vee, VOH=2.0V
H = 0.1V
-
12
IlA
Halt Delay Time
tHO
200
- Il5
Operation Recovery Time
tRe
200
- IlS
HLT Fall Time
tf.Hl T -
1000
Il5
HLT Rise Time
trHl T
-
1000
Il5
HL T "Low" Hold Time
tHlT
800
-
Il5
Rf Oscillation,
HLT "High" Hold Time
tOPR
External Clock
0.2
ms -
Operation,
Vce=2.5 to 5.5V
External
Reset
~=2.5 to 5.5V
RESET
Pulse Width (1)
tRST1
HLT=Va;
Rf Oscillation,
2
-
ms
External Clock
Operation
External
Reset
RESET Pulse Width (2)
tRsT2
~2.5t05.5V 2·Tinst
- Il5
= Vee
RESET Fall
Time
tfRST
FfCi'= Vee
-
20 ms
RESET Rise Time
trRST
RIT=Vee
-
20 ms
(NOTE) All voltages are with respect to GNO.
• SIGNAL DESCRIPTION
The input and output signals for the HMCS46C, shown in
PIN ARRANGEMENT, are described in the following para-
graphs.
• Vee andGND
Power is supplied to the HMCS46C using these two pins.
Vee is power and GND is the ground connection.
• RESET
This pin allows resetting of the HMCS46C at times other
than the automatic resetting capability (ACL; Built·in Reset
Circuit) already in the HMCS46C. The HMCS46C can be reset
by pulling RESET high. Refer to RESET FUNCTION for addi-
tional information.
• OSCI and OSC
2
These pins provide control input for the built-in oscillator
circuit. A resistor, ceramic filter circuit, or an external oscillator
can be connected 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 HMCS46C in the Halt State
(Stand-by Mode).
The HMCS46C can be moved into the Halt State by pulling
'RLflow.
88
In the Halt State, the internal clock stops and all the internal
statuses (the RAM, the registers, the Carry F/F, the Status
F/F, the Program Counter, and all the internal statuses) are
held.
Consequently, the power consumption is reduced. By pulling
HLT high, the HMCS46C starts operation from the state just
before 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.
• INTo and INT,
These pins provide the capability for asynchronously apply-
ing external interrupts to the HMCS46C.
Refer to INTERRUPTS for additional information.
• Roo - R
o3
, R,o - Ru, R20 - R 23 , R30 - R33
These 16 lines are arranged into four 4-bit Data Input/Out·
put 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.
• Do - 015
These lines are 16 I-bit Discrete Input/Output Common
Terminals.