AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 204

• 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: -

20.3.10
Name:
Access:
Offset:
• PRESCALAR: Channel 0 Prescalar
• SELECTCLK: Select Clock
0: The divider_clock_0 is generated by divider driven by the SYSCAL bits.
1: The divider_clock_0 is connected to the low frequency clock.
• AUTOREL: Auto Reload
0: The counter is not automatically reloaded with the COUNTER[15:0] value when it reaches 0x0000.
1: The counter is automatically reloaded with the COUNTER[15:0] value when it reaches 0x0000.
• SYSCAL: System Clock Prescalar Value
This prescalar is used to divide the CORECLK when the system clock is selected (SELECTCLK = 0).
A write in this register can only be done if CHENS0 = 0 (i.e., channel 0 is disabled).
204
31
23
15
–
–
7
–
AT91SAM7A1
ST Channel 0 Prescalar Register
ST_PR0
Read/Write
0x080
Channel 0 counter_clock_frequency
divider_clock_0
30
22
14
–
–
6
–
AUTOREL
=
29
21
13
CORECLK
–
–
5
SELECTCLK
2
28
20
12
–
–
4
=
SYSCAL
SYSCAL
divider_clock_1
+
27
19
11
–
–
3
1
2
PRESCALAR
26
18
10
–
2
PRESCALAR
SYSCAL
25
17
–
9
1
6048B–ATARM–29-Jun-06
24
16
–
8
0