SAM7S256 Atmel Corporation, SAM7S256 Datasheet - Page 156
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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
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Instruction Cycle Timings
6.8
6-14
Store register
Cycle
1
2
The first cycle of a store register instruction is similar to the first cycle of load register
instruction. During the second cycle the base modification is performed, and at the same
time the data is written to memory. There is no third cycle.
The cycle timings are listed in Table 6-11 where:
•
•
•
Address
pc+2L
alu
pc+3L
c represents the current processor mode:
—
—
d=0 if the T bit has been specified in the instruction (such as LDRT) and d=c at
all other times.
s represents the size of the data transfer shown by MAS[1:0] (see Table 6-10 on
page 6-13).
Copyright © 1994-2001. All rights reserved.
c=0 for User mode
c=1 for all other modes
MAS[1:0]
i
s
nRW
0
1
Table 6-11 Store register instruction cycle operations
Data
(pc+2L)
Rd
nMREQ
0
0
SEQ
0
0
nOPC
0
1
ARM DDI 0029G
nTRANS
c
d
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