AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 68

• 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: -

11.1.6
Name:
Access:
Address:
• OSTB[9:0]: Oscillator Stabilization Time
Number of clock cycles needed before master oscillator stabilization. This register must be configured by the software after
a hardware reset and before using the master oscillator.
The required time for master oscillator stabilization is 4 ms maximum and is based on the MCK/256 clock.
The default value is 0x000000B0 guaranteeing 176 x 256 MCK clock cycles (i.e., 11.264 ms with MCK = 4.0 MHz)
• OSTKEY[15:0]: Key for Write Access into the CM_OST Register
Any write in the OSTB[9:0] bits will only be effective if the OSTKEY[15:0] bits are equal to 0xDB5A. These bits are always
read at 0.
68
31
23
15
–
7
AT91SAM7A1
CM Oscillator Stabilization Timer Register
CM_OST
Read/Write
0xFFFEC014
30
22
14
–
6
29
21
13
–
5
28
20
12
–
4
OSTKEY[15:8]
OSTKEY[7:0]
OSTB[7:0]
27
19
11
–
3
26
18
10
–
2
25
17
9
1
OSTB[9:8]
6048B–ATARM–29-Jun-06
24
16
8
0