4513 datasheet(59/97 Pages) RENESAS

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4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

➉ A-D converter-1

When the operating mode of the A-D converter is changed from

the comparator mode to the A-D conversion mode with the bit 3

of register Q2 in a program, be careful about the following notes.

• Clear the bit 2 of register V2 to “0” to change the operating mode

of the A-D converter from the comparator mode to the A-D con-

version mode with the bit 3 of register Q2 (refer to Figure 46➄).

• The A-D conversion completion flag (ADF) may be set when the

operating mode of the A-D converter is changed from the com-

parator mode to the A-D conversion mode. Accordingly, set a

value to register Q2, and execute the SNZAD instruction to clear

the ADF flag.

Do not change the operating mode (both A-D conversion mode

and comparator mode) of A-D converter with the bit 3 of register

Q2 during operating the A-D converter.

...

; (✕0✕✕2)

TV2A

; The SNZAD instruction is valid ........ ➄

; (0✕✕✕2)

TQ2A

; Change of the operating mode of the A-D

converter from the comparator mode to the

A-D conversion mode

SNZAD

NOP

...

Fig. 47 Analog input external circuit example-1

Fig. 48 Analog input external circuit example-2

POF instruction

Execute the POF instruction immediately after executing the

EPOF instruction to enter the RAM back-up.

Note that system cannot enter the RAM back-up state when ex-

ecuting only the POF instruction.

Be sure to disable interrupts by executing the DI instruction be-

fore executing the EPOF instruction.

Analog input pins

Note the following when using the analog input pins also for I/O

port P4 functions:

• Even when P40/AIN4–P43/AIN7 are set to pins for analog input,

they continue to function as P40–P43 I/O. Accordingly, when any

of them are used as I/O port P4 and others are used as analog

input pins, make sure to set the outputs of pins that are set for

analog input to “1.” Also, the port input function of the pin func-

tions as an analog input is undefined.

• TALA instruction

When the TALA instruction is executed, the low-order 2 bits of

multaneously, the low-order 2 bits of register A is “0.”

Program counter

Make sure that the PCH does not specify after the last page of

the built-in ROM.

Port P3

In the 4513 Group, when the IAP3 instruction is executed, note

that the high-order 2 bits of register A is undefined.

A-D converter-2

Each analog input pin is equipped with a capacitor which is used

to compare the analog voltage. Accordingly, when the analog

voltage is input from the circuit with high-impedance and, charge/

discharge noise is generated and the sufficient A-D accuracy

may not be obtained. Therefore, reduce the impedance or, con-

nect a capacitor (0.01

µF to 1 µF) to analog input pins (Figure

47).

When the overvoltage applied to the A-D conversion circuit may

occur, connect an external circuit in order to keep the voltage

within the rated range as shown the Figure 48. In addition, test

the application products sufficiently.

✕: this bit is not related to the change of the

operating mode of the A-D conversion.

Fig. 46 A-D converter operating mode program example

Sensor

AIN

About 1k

Ω

Sensor

AIN

Apply the voltage withiin the specifications

to an analog input pin.

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