SAM7S128 Atmel Corporation, SAM7S128 Datasheet - Page 53
SAM7S128
Manufacturer Part Number
SAM7S128
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S128
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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2.5
ARM DDI 0029G
Operating modes
The ARM7TDMI processor has seven modes of operation:
•
•
•
•
•
•
•
Modes other than User mode are collectively known as privileged modes. Privileged
modes are used to service interrupts or exceptions, or to access protected resources.
Each register has a mode identifier as listed in Table 2-1.
User mode is the usual ARM program execution state, and is used for executing
most application programs.
Fast Interrupt (FIQ) mode supports a data transfer or channel process.
Interrupt (IRQ) mode is used for general-purpose interrupt handling.
Supervisor mode is a protected mode for the operating system.
Abort mode is entered after a data or instruction Prefetch Abort.
System mode is a privileged user mode for the operating system.
You can only enter System mode from another privileged mode by modifying the
mode bit of the Current Program Status Register (CPSR).
Undefined mode is entered when an undefined instruction is executed.
Copyright © 1994-2001. All rights reserved.
Note
Table 2-1 Register mode identifiers
Mode
User
Fast interrupt
Interrupt
Supervisor
Abort
System
Undefined
Programmer’s Model
Mode identifier
usr
fiq
irq
svc
abt
sys
und
2-7
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