UPD6600A NEC, UPD6600A Datasheet - Page 17

• Manufacturer Part Number: UPD6600A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

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