M42800A Atmel Corporation, M42800A Datasheet - Page 181

• 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

7.6
ARM DDI 0029G
Data bus control
Figure 7-5 shows the ARM7TDMI data bus control timing. The timing parameters used
in Figure 7-5 are listed in Table 7-5.
The cycle shown in Figure 7-5 is a data write cycle because nENOUT was driven LOW
during phase one. Here, DBE has first been used to modify the behavior of the data bus,
and then nENIN.
nENOUT
D[31:0]
nENIN
MCLK
DBE
Note
Copyright © 1994-2001. All rights reserved.
Symbol
T
T
T
T
T
T
dbe
dbnen
dbz
doh
dout
dout
T
T
dbnen
dbz
Parameter
Data bus enable time from DBEr
DBE to nENOUT valid
Data bus disable time from DBEf
DOUT[31:0] hold from MCLKf
MCLKf to D[31:0] valid
T
dbe
Table 7-5 Data bus control timing parameters
T
dbz
Figure 7-5 Data bus control timing
T
dbnen
T
dbe
AC and DC Parameters
Parameter type
Maximum
Maximum
Minimum
Maximum
Maximum
T
doh
7-9