M42800A Atmel Corporation, M42800A Datasheet - Page 161

• Manufacturer Part Number: M42800A
• Manufacturer: Atmel Corporation

Specifications of M42800A

• Flash (kbytes): 0 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 33 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 54
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.3/5.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

6.12
ARM DDI 0029G
Cycle
1
2
3
Software interrupt and exception entry
Address
pc+2L
Xn
Xn+4
Xn+8
Exceptions (including software interrupts) force the PC to a particular value and cause
the instruction pipeline to be refilled. During the first cycle the forced address is
constructed, and a mode change can take place. The return address is moved to R14 and
the CPSR to SPSR_svc.
During the second cycle the return address is modified to facilitate return, though this
modification is less useful than in the case of the branch with link instruction.
The third cycle is required only to complete the refilling of the instruction pipeline.
The cycle timings are listed in Table 6-15 where:
•
•
•
•
MAS
[1:0]
i
2
2
pc for:
—
—
—
—
C represents the current mode-dependent value
T represents the current state-dependent value
Xn is the appropriate trap address.
nRW
0
0
0
Copyright © 1994-2001. All rights reserved.
software interrupts is the address of the SWI instruction
Prefetch Aborts is the address of the aborting instruction
Data Aborts is the address of the instruction following the one which
attempted the aborted data transfer
other exceptions is the address of the instruction following the last one to
be executed before entering the exception
Data
(pc+2L)
(Xn)
(Xn+4)
Table 6-15 Software Interrupt instruction cycle operations
nMREQ
0
0
0
SEQ
0
1
1
nOPC
0
0
0
nTRANS
C
1
1
Instruction Cycle Timings
Mode
old
exception
exception
T
0
0
TBIT
6-19