AD6426 Analog Devices, AD6426 Datasheet - Page 17

• Manufacturer Part Number: AD6426
• Description: Enhanced GSM Processor
• Manufacturer: Analog Devices

The EEPROM interface is controlled entirely through software
via the EEPROM register. This allows support for every
desired timing and protocol.
SIM Interface
The AD6426 allows direct interfacing to the SIM card via a
dedicated SIM interface. This interface consists of 7 pins as
shown in Table 7. Some applications may not require
SIMPROG and SIMCARD; thus SIMPROG and SIMCARD
can be re-used as additional general purpose I/O-pins.
Accessory Interface
The AD6426 provides 12 interface pins listed in Table 8 for
control of peripheral devices such as a car kit. However, two
general purpose I/O-pins of the Accessory Interface are
proposed to be used for additional control of the radio section
as described in the Radio Interface chapter.
All GPIO pins start up as inputs. GPIO8 and GPIO9 are
controlled by flags in CC Control Register 79. When the
GPIOn OP Enable flag is set to 0, the GPIOn Data flag
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)
Preliminary Technical Information
Bit
Name
GPIO9:0
GPCS
4
2
1
0
Name
SIMCARD
SIMDATAOP
SIMDATAIP
SIMCLK
SIMRESET
SIMPROG
SIMSUPPLY
EEPROM CC Control Register 8
EEPROM Data Output Enable
when set to 1, the content of bit 0 will be written to
the pin.
EEPROM Clock
Connected to the EEPROMCLK pin
EEPROM Enable
Connected to the EEPROMENABLE pin
EEPROM Data
Connected to the EEPROMDATA pin
Table 8. Accessory Interface
Table 7. SIM Interface
I/O
I/O
O
I/O
O
O
O
O
O
I
I
Function
General purpose
inputs/outputs
General purpose chip select
Function
SIM card detect
SIM data output
SIM data input
SIM clock
SIM reset
SIM program enable
SIM supply enable
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reflects the input pin state when read and writing to GPIOn
Data has no effect.
When the GPIOn OP Enable flag is set to 1, the GPIOn Data
flag returns when read the last value written to it and controls
the GPIOn pin when written to it.
Additional general purpose inputs and outputs are available
under software control. The following pins shown in Table 9
become general purpose inputs/outputs or outputs.
If the pins SIMCARD and SIMPROG are not required in the
application, they can be used as additional H8 programmable
general purpose inputs or outputs.
Setting GPO10 Select (CC Control Register 7) to 1, will
transform the pin ADD20 into a general purpose output
allowing the pin to be directly controlled via GPO10 Data.
By setting GPO11 Select (CC Control Register 77) to 1 and
FLASHPWD Disable to 1, the pin FLASHPWD becomes a
general purpose output. The pin state is toggled by setting the
GPO11 Data flag.
To increase the flexibility of the AD6426, three pins in the
Radio Interface are multiplexed within GPO functions. The
pins multiplexed are: SYNTHEN1, AGCA and AGCB, with
the default function being the Radio Interface. The mode of
these pins is controlled by the Channel Codec Register
ccGPO.
The GPO[n]Sel bit selects the function of the pin. Setting
GPO[n]Sel to one will enable the pin to be controlled by the
GPO[n] bit. The GPO[n]Sel bit will override any other pin
function selection.
Pin Name
SIMCARD
SIMPROG
ADD20
FLASHPWD
TXPA
CALIBRATERADIO
TXENABLE
SYNTHEN1
AGCA
AGCB
USCRI
USCRTS
USCCTS
Table 9. Additional GPIO / GPO Pins
Confidential Information
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
O
I
New Function
GPIO16
GPIO15
GPO10
GPO11
GPO12
GPO13
GPO14
GPO17
GPO18
GPO19
GPO20
GPO21
GPI22
AD6426