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AD6426

Enhanced GSM Processor

Analog Devices 

Preliminary Technical Information

Serial Display Interface

The serial display interface is compatible with display drivers

by Motorola and Seiko-Epson. The display driver by Motorola

uses an SPI serial bus which requires an inverted or delayed

clock in comparison to the Seiko-Epson type display driver.

In the Motorola mode the data is delayed by one half clock

cycle such that the data is driven on the rising edge of SCLK

instead of on the falling edge.

The serial display interface consists of four pins; a serial data

output (DISPD0), clock (DISPCLK), chip enable (DISPEN)

and address (DISPA0). These pins are multiplexed with

GPIO4, GPIO3, LCDCTL and DISPLAYCS.

Bit 1 (DISP) of the MEMIF H8 Peripheral Control Register 80

controls the configuration of the display interface. With this

set to 0, the parallel display interface is used. Setting this bit

to one enables the use of the serial display interface. This bit

is set to 0 on reset.

Bit 4 (SERDISP MODE) of the SERDISPLAY/NMI H8

Peripheral Control Register 106 controls the serial display

mode. The default setting is Seiko-Epson mode. To enable the

Motorola mode the user must set the register bit to ONE.

Display Reset

No dedicated pin is used to reset the display sub system. It is

recommended that the VBCRESET pin is used for this

function by connecting the Reset input on the display and the

Reset input on the VBC to the AD6426 VBCRESET pin. The

VBC and display cannot be reset independently. However one

of the GPIO pins can be used to reset the display separately.

Battery ID Interface

The AD6426 provides a single-wire interface compatible with

the Dallas Semiconductor™ DS2434or DS2435 Battery

Identification chip. The communication protocol supports three

operations: RESET, READ and WRITE. These operations

permit reading the present status off the battery and writing

updated information to the ID chip. The interface is available

as the BATID function multiplexed on the GPIO5 pin.

AD6426

Bit 3 (DALLAS EN) of the MEMIF H8 Peripheral Control

Register 80 controls the enabling of the battery ID interface

module. Setting this bit to zero enables the interface, resetting

the bit disables it. This bit is set to one on reset.

EVBC Interface

The AD6426 interfaces directly to the Enhanced Voiceband

Baseband Converter AD6425 through the pins shown in Table

12.The communication is performed through three serial ports:

the Auxiliary Serial Port (ASPORT), the Baseband Serial Port

(BSPORT) and the Voiceband Serial Port (VSPORT). Layer 1

software enables/disables the clock output in order to reduce

system power consumption to a minimum if operation of the

AD6425 is not required. Figure 6 shows the interface between

the AD6426 and the AD6425 as well as to the AD6432 IF

chip.

Table 12. EVBC Interface

Name

CLKOUT

EVBCRESET

ASPORT

ASDO

ASOFS

ASCLK

ASDI

BSPORT

BSDO

BSOFS

BSCLK

BSIFS

BSDI

VSPORT

VSDO

VSDI

VSCLK

VSFS

I/O Function

O Clock Output to EVBC

O Reset Output to EVBC

O Data Output

O Output Framing Signal

O Clock Output

I Data Input

O Data Output

O Output Framing Signal

I Clock Input

I Input Framing Signal

I Data Input

O Data Output

I Data Input

I Clock Input

I Input/Output Framing Signal

This Information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog Devices assumes no

obligation regarding future manufacture unless otherwise agreed to in writing. No responsibility is assumed by Analog Devices for its use; nor for any

infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent

rights of Analog Devices.

Revision Preliminary 2.3 (June 9, ´98)

- 20 -

Confidential Information

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