AT91SAM7S32B-AU-001 Atmel, AT91SAM7S32B-AU-001 Datasheet - Page 14
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AT91SAM7S32B-AU-001
Manufacturer Part Number
AT91SAM7S32B-AU-001
Description
8-Bit Microcontrollers
Manufacturer
Atmel
Datasheet
1.AT91SAM7S16-MU.pdf
(51 pages)
Specifications of AT91SAM7S32B-AU-001
Termination Type
SMD
Interface
I2C, SPI, UART
Embedded Interface Type
I2C, SPI, UART
Supply Voltage Max
3.6V
No. Of Adc Inputs
8
Flash Memory Size
32KB
No. Of I/o Pins
21
Core Size
32 Bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
6. I/O Lines Considerations
6.1
6.2
6.3
6.4
6.5
14
JTAG Port Pins
Test Pin
Reset Pin
ERASE Pin
PIO Controller A Lines
AT91SAM7S Series Summary
TMS, TDI and TCK are schmitt trigger inputs. TMS and TCK are 5-V tolerant, TDI is not. TMS,
TDI and TCK do not integrate a pull-up resistor.
TDO is an output, driven at up to VDDIO, and has no pull-up resistor.
The JTAGSEL pin is used to select the JTAG boundary scan when asserted at a high level. The
JTAGSEL pin integrates a permanent pull-down resistor of about 15 kΩ to GND, so that it can be
left unconnected for normal operations.
The TST pin is used for manufacturing test, fast programming mode or SAM-BA Boot Recovery
of the AT91SAM7S Series when asserted high. The TST pin integrates a permanent pull-down
resistor of about 15 kΩ to GND, so that it can be left unconnected for normal operations.
To enter fast programming mode, the TST pin and the PA0 and PA1 pins should be tied high
and PA2 tied to low.
To enter SAM-BA Boot Recovery, the TST pin and the PA0, PA1 and PA2 pins should be tied
high for at least 10 seconds. Then a power cycle of the board is mandatory.
Driving the TST pin at a high level while PA0 or PA1 is driven at 0 leads to unpredictable results.
The NRST pin is bidirectional with an open drain output buffer. It is handled by the on-chip reset
controller and can be driven low to provide a reset signal to the external components or asserted
low externally to reset the microcontroller. There is no constraint on the length of the reset pulse,
and the reset controller can guarantee a minimum pulse length. This allows connection of a sim-
ple push-button on the pin NRST as system user reset, and the use of the signal NRST to reset
all the components of the system.
The NRST pin integrates a permanent pull-up resistor to VDDIO.
The ERASE pin is used to re-initialize the Flash content and some of its NVM bits. It integrates a
permanent pull-down resistor of about 15 kΩ to GND, so that it can be left unconnected for nor-
mal operations.
Programming of this pull-up resistor is performed independently for each I/O line through the
PIO controllers.
5V-tolerant means that the I/O lines can drive voltage level according to VDDIO, but can be
driven with a voltage of up to 5.5V. However, driving an I/O line with a voltage over VDDIO while
the programmable pull-up resistor is enabled will create a current path through the pull-up resis-
• All the I/O lines PA0 to PA31on AT91SAM7S512/256/128/64/321 (PA0 to PA20 on
• All the I/O lines PA0 to PA31 on AT91SAM7S161 (PA0 to PA20 on AT91SAM7S16) are not
AT91SAM7S32) are 5V-tolerant and all integrate a programmable pull-up resistor.
5V-tolerant and all integrate a programmable pull-up resistor.
6175IS–ATARM–30-Aug-10