UPD720122 datasheet(10/82 Pages) NEC

10 / 82 page

Data Sheet S16685EJ2V0DS

µPD720122

(2/2)

Pin Name

I/O

Buffer Type

Active Level

Function

RSDM

USB full speed D- O

USB’s full speed D

− signal

M(1:0)

5 V tolerant Input

Function mode setting

VBUS

5 V tolerant Input

Note

VBUS monitoring

AVDD, PVDD

3.3 VDD for Analog circuit

VDD

3.3 VDD

AVSS, PVSS

VSS for Analog circuit

VSS, GND

VSS

Not connect

Reserved

Not used

Note

VBUS pin may be used to monitor for VBUS line even if VDD, AVDD, and PVDD are shut off. System must

ensure that the input voltage level for VBUS pin is less than 3.0 V due to the absolute maximum rating is not

exceeded.

Remark

“5 V tolerant“ means that the buffer is 3.3 V buffer with 5 V tolerant circuit.

The operation mode of the BIU can be set by external pins, as shown below. Fix external pins (M1 and M0) when

using them.

BIU Operation Mode

Outline

16-bit mode

(Function 1)

A 16-bit CPU bus and an external local bus dedicated to data transfer for bulk IN/OUT can

be used in this mode. The internal register length is 16 bits.

8-bit mode

(Function 2)

Multiplexed bus mode of 8-bit address bus and 8-bit data bus.

The register length is 8 bits only in this mode (registers can only be accessed in byte units).

Therefore, the address space in this mode differs from that in the other modes.

The active levels of some external local bus control pins can be changed by the Active pin.

16-bit mix mode

(Function 3)

Multiplexed bus mode of 8-bit address bus and 16-bit data bus.

The internal register length is 16 bits.

The active levels of some external local bus control pins can be changed by the Active pin.

Setting prohibited

(Function 4)

Setting prohibited

UPD720122 Datasheet(PDF) 10 Page - NEC

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