AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 317

• Manufacturer Part Number: AT91SAM7A1-AU
• Description: IC ARM7 MCU 32BIT ROMLESS144LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7A1-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 40MHz
• Connectivity: CAN, EBI/EMI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: AT91SAM7A1-EK - BOARD EVAL FOR AT91SAM7A1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

26.2
26.3
6048B–ATARM–29-Jun-06
Pin Description
Clock Sources
Table 26-1
Table 26-1.
The timer controller can use one of eight different clocks. The CLKS[2:0] bits of the mode reg-
isters GPTx_MR determine whether the counter is clocked by one of the five internal clock
sources generated in the prescalar block and derived from CORECLK or one of the three
external clock sources (TCLKx).
Figure 26-2
Figure 26-2. Clock Selection Block
The counter clock sources can be any of the following:
Pin (x = channel)
TIOAx
TIOBx
TCLKx
• External event input XCx
• One of 5 internal clocks (CORECLK/2, CORECLK/8, CORECLK/32, CORECLK/128,
CORECLK/1024)
shows the internal pin configurations in the different operating modes.
shows the clock selection block.
Pin Definition
CORECLK/2
CORECLK/8
CORECLK/32
CORECLK/128
CORECLK/1024
XC0
XC1
XC2
Capture or Trigger
Capture Mode
External Clock
1
Trigger
GPTx_MR[5:4]
Input
Input
Input
BURST[1:0]
GPTx_MR[2:0]
00
01
10
11
CLKS[2:0]
000
001
010
011
100
101
110
111
BURSTCLK
CLK
Single Waveform
External Clock
Waveform
GPTx_MR[3]
Trigger
Output
Mode
Input
Input
CLKI
0
1
Clock Counter
AT91SAM7A1
Dual Waveform Mode
External Trigger
External Clock
Waveform
Waveform
Output
Output
Input
317