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UPD6600AGS Datasheet

  • UPD6600AGS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMI...

  • 36頁(yè)

  • NEC   NEC

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碌
PD6124A, 6600A
16. LOW-VOLTAGE DETECTOR (RESET) CIRCUIT
The
碌
PD6124A and 6600A are internally provided with the low-voltage detector (reset) circuit, in order to prevent
program hang-up.
When V
DD
goes down to 1 V or below, an internal reset signal is generated. In the reset condition, a low level is
output to the S-OUT pin.
AC pin
Internal reset signal
Reset circuit
To S-OUT pin
Caution
The low-voltage detector circuit starts operating at a voltage ranging from 1 to 2.2 V. Hence, if the
supply voltage is 2 V or lower, the program counter may hang up before the low-voltage detector
circuit operates.
17. MASK OPTIONS (PLA DATA)
The following items can be selected by mask option selection:
鈥?Provide/not provide K
I
, S-IN pin pull-down resistor
鈥?Carrier duty selection (1/2, 1/3) at f
OSC
/12
鈥?Hang-up detection specification
Mask option data should be registered at the object code end.
BIT ASSIGNMENT BY SWITCH SELECTION
Address
MSB
Corresponding
Portion
7
K
I
pull-down resistor
Note
K
I3
6
K
I2
5
K
I1
4
K
I0
3
2
0
1
0
LSB
0
1
Duty
S-IN
0
0
0
Duty
selection
0
0
S-IN
pull-down
resistor
0
2
Hang-up detection
K
I/O
ALL
HALT
S-IN
HALT
K
I/O
HALT
K
I
0
Note
The setting (bit) positions differ from the
碌
PD6125A and 6126A.
17

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