M42800A Atmel Corporation, M42800A Datasheet - Page 75

• 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

13.6
Register Name:
Access Type:
Offset:
Reset Value:
• PIV: Period Interval Value
Defines the value loaded in the 16-bit counter of the Period Interval Timer. The maximum period is obtained by program-
ming PIV at 0x0 corresponding to 65536 Slow Clock cycles.
13.7
Register Name:
Access Type:
Offset:
Reset Value:
• WDV: Watchdog Counter Value
Defines the value loaded in the 16-bit counter. The maximum period is obtained by programming WDV to 0x0 correspond-
ing to 65536 • 128 Slow Clock cycles.
• RSTEN: Reset Enable
0 = No reset is generated when a watchdog overflow occurs.
1 = An internal reset is generated when a watchdog overflow occurs.
• EXTEN: External Signal Assertion Enable
0 = The NWDOVF is not tied low when a watchdog overflow occurs.
1 = The NWDOVF is tied low during 8 Slow Clock cycles when a watchdog overflow occurs.
1779D–ATARM–14-Apr-06
31
23
15
31
23
15
–
–
7
–
–
7
System Timer Period Interval Mode Register
System Timer Watchdog Mode Register
ST_PIMR
Read/Write
0x04
0x0
30
22
14
ST_WDMR
Read/Write
0x08
0x0002 0000
30
22
14
–
–
6
–
–
6
29
21
13
29
21
13
–
–
5
–
–
5
28
20
12
28
20
12
–
–
4
–
–
4
WDV
WDV
PIV
PIV
27
19
11
27
19
11
–
–
3
–
–
3
26
18
10
26
18
10
–
–
2
–
–
2
AT91M42800A
EXTEN
25
17
25
17
–
–
9
1
–
9
1
RSTEN
24
16
24
16
–
–
8
0
–
8
0
75