NJU3502L データシートの表示（PDF） - Japan Radio Corporation

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NJU3502L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3502

Though the data of the Timer can be read in the count operation, the read data is sometimes incorrect

when the clock inputs to the counter during the reading operation.

When the 8-bit counter data is read in count operation as shown in the following timing chart(An

example of data reading from the counter to RAM), Timer often counts up between the first 4-bit data

reading and the second. In case of the following chart, though the timer data is "0Fh" when the lower 4-

bit data is gotten, it is "10h" when the higher 4-bit data is gotten. Therefore the final data becomes to be

"1Fh".

[An example of data reading from the counter to RAM]

Counter clock

(prescaler

8 divide)

Timer Data

(8bit)

0D

0E

0F

10

11

12

Reading

Y-register

LSB

RAM

(4bit Y-address=0)

RAM

(4bit Y-address=1)

E

0

F

1

1

1

0Eh

1Fh:Incorrect data

11h

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