SAM7S16 Atmel Corporation, SAM7S16 Datasheet - Page 89
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SAM7S16
Manufacturer Part Number
SAM7S16
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S16
Flash (kbytes)
16 Kbytes
Pin Count
48
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
21
Ext Interrupts
21
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Uart
2
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)
4
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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Memory Interface
nENOUT
PAD
DOUT[31:0]
XDATA[31:0]
ARM7TDMI
DIN[31:0]
Figure 3-14 External connection of unidirectional buses
Bidirectional data bus
When BUSEN is LOW, the buffer between DIN[31:0] and D[31:0] is disabled. Any
data presented on DIN[31:0] is ignored. Also, when BUSEN is LOW, the value on
DOUT[31:0] is forced to
.
When the ARM7TDMI processor is reading from memory DIN[31:0] is acting as an
input. During write cycles the ARM7TDMI core must output data. During phase 2 of
the previous cycle, the signal nRW is driven HIGH to indicate a write cycle. During the
actual cycle, nENOUT is driven LOW to indicate that the processor is driving D[31:0]
as an output. Figure 3-15 on page 3-20 shows the bus timing with the data bus enabled.
Figure 3-16 on page 3-20 shows the circuit that exists in the processor for controlling
exactly when the external bus is driven out.
ARM DDI 0029G
Copyright © 1994-2001. All rights reserved.
3-19
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