Stollmann
E + V GmbH
C11/G2
Hardware reference
Author: jj
Date of Saving: 23.02.07
Ref: C11-G2_HWreference_V1_0.doc
Revision: 0.1
Page 11 of 11
•
LED’s can be driven directly on specific GPIO lines when I
o
stays below 8mA
All current consumption data in this document are given with I
O
(GPIO) = 0mA
See chapter 5 Electrical Characteristics for detailed information.
•
All I/O signals except USB, GPIO(4) and JTAG are connected directly from the
AT91SAM7S pins to the user accessible stamp pins. Therefore the electrical
characteristics of the I/O pins are programmable in regard to direction, pull-up
resistor, function, push-pull or open drain. Please see specific application software
documentation for details. After reset all GPIO’s have pull-ups avtivated. GPIO10,
GPIO8 and TXD have 50kR to 300kR pull-ups, all other I/Os have 5kR to 20kR
pull-ups
3.5 Alternate GPIO/IO Functions
Application specificly dedicated GPIO or IO pins can be programmed to alternative
functionalities. Then pin functionality and direction are fixed for the activated function
block. Many GPIO’s or IO’s are used by the SPP application. See chapter
SPP
Configuration
. Probably some of them can be released for use by other function blocks.
Co-functionality of blocks has to be carefully considered, because pin multiplexing
possibilities are fixed by the ATMEL AT91SAM7S CPU and using a function block often
causes that other function blocks can’t be used at the same time. Please refer to the
ATMEL data sheet AT91SAM7Sxxx Rev. F for complete information. The possibilities
depicted in the following chapters are an subset only.
The following function blocks may be usable on the C11/G2:
3.5.1 Master/Slave SPI Interface
Direction
Pin #
GPIO#
IO Name
Alternative
Signal Name
Description
Master
Slave
A5
GPIO1
MISO
Master In Slave Out
IN
OUT
A4
GPIO0
MOSI
Master Out Slave In
OUT
IN
A3
GPIO3
SPCK
Serial Clock
OUT
IN
A6
GPIO2
NPCS0
Peripheral. Chip Select
OUT
IN
Clock polarity and phase are programmable. The chip select signal is low active.
