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Revision 1.03

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AS1115

Datasheet - D e t a i l e d D e s c r i p t i o n

Feature Register (0x0E)

The Feature Register is used for enabling various features including switching the device into external clock mode,

applying an external reset, selecting code-B or HEX decoding, enabling or disabling blinking, setting the blinking rate,

and resetting the blink timing.

Note:

At power-up the Feature Register is initialized to 0.

Table 20. Feature Register Summary

D7

D6

D5

D4

D3

D2

D1

D0

blink_

start

sync

blink_

freq_sel

blink_en

NU

decode_sel

reg_res

clk_en

Table 21. Feature Register Bit Descriptions (Address (HEX) = 0xXE)

Addr: 0xXE

Feature Register

Enables and disables various device features.

Bit

Bit Name

Default

Access

Bit Description

D0

clk_en

0R/W

External clock active.

0 = Internal oscillator is used for system clock.

1 = Pin CLK of the serial interface operates as system clock input.

D1

reg_res

0R/W

Resets all control registers except the Feature Register.

0 = Reset Disabled. Normal operation.

1 = All control registers are reset to default state (except the Feature

Register) identically after power-up.

Note:

The Digit Registers maintain their data.

D2

decode_sel

0R/W

Selects display decoding for the selected digits (Table 8 on page 13).

0 = Enable Code-B decoding (see Table 9 on page 14).

1 = Enable HEX decoding (see Table 10 on page 14).

D3

NU

Not used

D4

blink_en

0R/W

Enables blinking.

0 = Disable blinking. 1 = Enable blinking.

D5

blink_freq_sel

0R/W

Sets blink with low frequency (with the internal oscillator enabled):

0 = Blink period typically is 1 second (0.5s on, 0.5s off).

1 = Blink period is 2 seconds (1s on, 1s off).

D6

sync

0R/W

Synchronizes blinking on the rising edge of pin LD/CS. The multiplex

and blink timing counter is cleared on the rising edge of pin LD/CS. By

setting this bit in multiple devices, the blink timing can be synchronized

across all the devices.

D7

blink_start

0R/W

Start Blinking with display enabled phase. When bit D4 (blink_en) is set,

bit D7 determines how blinking starts.

0 = Blinking starts with the display turned off.

1 = Blinking starts with the display turned on.