[AP1021]

015000428-E-00

2015/01

- 8 -

10. Functional Descriptions

AP1021 can set outputs as Enable mode (Hi-Z) by registers or pins. When OE12 bit or OE34 bit is set to “0”

→

“1” during SELOE bit = “0”, the outputs of OUT1/2 or OUT3/4 pin is set to Hi-Z. When OE12 pin or

OE34 pin is set to “L”→“H” during SELOE bit = “1”, the outputs of OUT1/2 or OUT3/4 pin is set to Hi-Z.

Table 1. Enable mode setting (x: Don’t care)

SELOE bit

OE12 bit

OE34 bit

OE12 pin

OE34 pin

OUT1/2 pin

OUT3/4 pin

“0”

“0”

“0”

x

x

Hi-Z

Hi-Z

(default)

‘“0”

“0”

“1”

x

x

Hi-Z

Normal operate

“0”

“1”

“0”

x

x

Normal operate

Hi-Z

“0”

“1”

“1”

x

x

Normal operate

Normal operate

“1”

x

x

“L”

“L”

Hi-Z

Hi-Z

“1”

x

x

“L”

“H”

Hi-Z

Normal operate

“1”

x

x

“H”

“L”

Normal operate

Hi-Z

“1”

x

x

“H”

“H”

Normal operate

Normal operate

Figure 2. The example of an Enable mode setup by OE12 & OE34 pin

The figure is an image figure of 1/4step.

Iout1/3

OE12 pin

OE34 pin

Enable

Iout2/4