µPD6124A, 6600A

17

16. LOW-VOLTAGE DETECTOR (RESET) CIRCUIT

The

µPD6124A and 6600A are internally provided with the low-voltage detector (reset) circuit, in order to prevent

program hang-up.

output to the S-OUT pin.

Reset circuit

Internal reset signal

AC pin

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:

• Hang-up detection specification

Mask option data should be registered at the object code end.

BIT ASSIGNMENT BY SWITCH SELECTION

0

1

2

7

K

0

K

ALL

6

K

0

HALT

S-IN

5

K

0

HALT

K

4

K

Duty

selection

HALT

K

Note

I3

I2

I1

I0

I

I/O

I/O

3

0

2

0

1

S-IN

pull-down

resistor

0

0

MSB

LSB

pull-down resistor

Corresponding

Portion

Hang-up detection

Duty

S-IN

0

0

Note

The setting (bit) positions differ from the

µPD6125A and 6126A.