SAM7S256 Atmel Corporation, SAM7S256 Datasheet - Page 110
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
SAM7S256
Manufacturer Part Number
SAM7S256
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S256
Flash (kbytes)
256 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)
64
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
- Current page: 110 of 284
- Download datasheet (2Mb)
Coprocessor Interface
4.4
4.4.1
4-6
Coprocessor interface handshaking
The coprocessor
Coprocessor interface handshaking is described as follows:
•
•
•
•
•
•
•
The ARM7TDMI core and any coprocessors in the system perform a handshake using
the signals shown in Table 4-2.
These signals are explained in more detail in Coprocessor signaling on page 4-7.
The coprocessor decodes the instruction currently in the Decode stage of its pipeline,
and checks whether that instruction is a coprocessor instruction. A coprocessor
instruction contains a coprocessor number that matches the coprocessor ID of the
coprocessor.
If the instruction currently in the Decode stage is a relevant coprocessor instruction:
1.
2.
The coprocessor can drive CPA and CPB as soon as it decodes the instruction. It does
not have to wait for nCPI to be LOW but it must not commit to execute the instruction
until nCPI has gone LOW.
The coprocessor on page 4-6
The ARM7TDMI processor on page 4-7
Coprocessor signaling on page 4-7
Consequences of busy-waiting on page 4-8
Coprocessor register transfer instructions on page 4-9
Coprocessor data operations on page 4-10
Coprocessor load and store operations on page 4-10.
The coprocessor attempts to execute the instruction.
The coprocessor handshakes with the ARM7TDMI core using CPA and CPB.
Note
Copyright © 1994-2001. All rights reserved.
Signal
nCPI
CPA
CPB
Direction
ARM7TDMI core to coprocessor
Coprocessor to ARM7TDMI core
Coprocessor to ARM7TDMI core
Table 4-2 Handshaking signals
Meaning
NOT coprocessor instruction
Coprocessor absent
Coprocessor busy
ARM DDI 0029G
Related parts for SAM7S256
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
![U4255BM-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B-P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
![TDA4470](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
![ATF22V10B-25PC](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
![AT89C51ED2-IM](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
![AT24C01](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
![U6046B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: