SM5K3 datasheet(19/28 Pages) SHARP

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SM5K3/SM5K4/SM5K5

- 19 -

MODE REGISTERS

The

registers

which

control

functions

the

SM5K3/5K4/5K5 and which serve as counter/timer are

commonly referred to as “mode registers”. In the

SM5K3/5K4/5K5, R8 to RB are 8-bit mode registers;

and R3, RC, RE and RF are 4-bit mode registers.

To set data into the mode registers, the OUT

command is used; and to check the contents of the

mode registers IN command is used.

R3 (A/D pin selection register)

Any pin on 4-pin port P3 can be set accommodate

analog voltage (hereafter called A/D pin).

Bit 3

Bit i (i = 3 to 0)

Sets P3i pin to either general purpose input or

A/D pin

0 | (General purpose) input

1 | A/D input

R8 (A/D conversion control & A/D data

An 8-bit register used to control A/D conversion

and storing part of A/D conversion result. It also

stores the results of comparison.

Bit 7

Bits 7 to 6

Storage of A/D conversion result (A/D conversion

mode) and setting of internal voltage (comparison

mode)

• Use as part of a 10-bit data ragister in

combination with mode register R9.

• Bit R86 is the LSB.

• Store lower 2-bit of converted data in A/D

conversion mode.

• Use as lower 2-bit of internal voltage setting

data in comparison mode.

Bit 5

∗ A/D operation enable/disable flag

0 | Disable (A/D power source off)

1 | Enable (A/D power source on)

Bit 4

Storages of comparison result (read only)

0 | P3i pin voltage < internal setting voltage

1 | P3i pin voltage > internal setting voltage

(i = 3 to 0)

Bit 3

∗ S/R flag (start/clear)

0 | End of operation (or stop)

1 | Start of operation (or in operation)

Bit 2

Operation mode selection

0 | A/D conversion

1 | Comparison

Bits 1 to 0

Select one of A/D pins as A/D conversion

00 | P30

01 | P31

10 | P32

11 | P33

R9 (A/D data register)

The register to store the upper 8-bit of 10-bit data

resulting from A/D conversion.

Bit 7

Bit i (i = 7 to 0)

Storages of A/D conversion result (A/D conversion

mode) and setting of internal voltage (comparison

mode)

• Uses as part of a 10-bit data register in

combination with mode register R8.

• Bit R97 is the MSB.

• Stores upper 8-bit of A/D conversion result.

• Uses as upper 8-bit of internal voltage setting

data in comparison mode.

∗ When operation is end, these bits are cleared.

∗ Select one pin which is to be selected by mode register R8.

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