VR4102 datasheet(691/701 Pages) NEC

691 / 701 page

APPENDIX A DIFFERENCES BETWEEN VR4102 AND VR4101

691

A.2.10 AIU

(1) Audio Output Mode

The PCM output is employed in the VR4102 as an audio output mode. In the VR4101, Buzzer or PWM output is

selectable.

(2) Audio Input Mode

The VR4102 has an analog audio input which is connected to the on-chip A/D converter. The VR4101 does not

support any audio inputs.

(3) Audio Data Transfer

The VR4102 uses DMA transfer to prepare PCM data in the output operation and to store sampled data in the

input operation. In the VR4101, output frequency and period for the Buzz mode are set in the AIU registers, or

output high level and low level width for the PWM mode are prepared with DMA transfer.

(4) Volume Control

Volume of the audio outputs is controlled by an external circuit or by shifting data input to D/A converter in the

VR4102. In the VR4101, four steps of audio output volume can be set in the AIUMUTEREG register and are

controlled by an external circuit based on the settings in the register.

A.2.11 KIU

(1) Number of Keys Supported

In the VR4102, the number of scan lines used is selectable among 8, 10, and 12 by setting the SCANLINE

any of enabled keys are pressed using selected scan lines and 8 detection lines. The VR4101 can detect when

any of 64 keys are pressed using 8 scan lines and 8 detection lines.

When the VR4102 uses only 8 or 10 scan lines, the unused scan lines can be used as general-purpose output

ports. When the KIU is disabled in the VR4102, all the scan lines (KSCAN[11..0] pins) can be used as general-

purpose outputs (GPIO[43..32]).

(2) LCD Brightness Control

The VR4101 has LCD brightness control pins which are alternately used as KCSAN[1..0] pins and indicate the

contents of EVVOLREG register to specify brightness. The VR4102 has no pins for LCD brightness control.

(3) KIU Data Transfer

The VR4102 transfers KIU data by reading data buffers when an interrupt occurs, while the VR4101 transfers with

DMA.

VR4102 Datasheet(PDF) 691 Page - NEC