AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 197

• 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: -

20.1
20.2
6048B–ATARM–29-Jun-06
Interrupts
Power Management
Figure 20-1. Simple Timer Block Diagram
For each channel there are three types of interrupts:
where z is the channel number.
Each Simple Timer (ST0 and ST1) is provided with a power management block allowing opti-
mization of power consumption. See
• A CHDISz interrupt indicating that the channel has been disabled
• A CHLOADz interrupt indicating that the channel has started to down-count and load the
• A CHENDz interrupt indicating that the channel has finished down-counting. This interrupt
data
rises three CORECLK cycles after the down counter reaches the value 0x0000
CORECLK
LFCLK
Programmable
(SYSCAL)
SYSCAL[10:0]
STx_PRz
Divider
SELECTCLK
STx_PRz.4
1
0
”Power Management Block” on page
Programmable
(PRESCALAR)
PRESCALAR[3:0]
STx_PRz
Divider
CHENSz
STx_SR
STx_CTz
LOAD[15:0]
ENA
LOAD
Downcounter
STx_CR
SWRST
16-bit
CLR
COUNT
AT91SAM7A1
23.
= 0
CHENDz
STx_SR
197