AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 295

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Scanning the RESET Pin
Scanning the Clock Pins
4250C–CAN–03/04
Figure 144. Additional Scan Signal for the Two-wire Interface
The RESET pin accepts 3V or 5V active low logic for standard reset operation, and 12V
active high logic for High Voltage Parallel programming. An observe-only cell as shown
in Figure 145 is inserted both for the 3V or 5V reset signal - RSTT, and the 12V reset
signal - RSTHV.
Figure 145. Observe-only Cell for RESET pin
The AVR devices have many clock options selectable by fuses. These are: Internal RC
Oscillator, External Clock, (High Frequency) Crystal Oscillator, Low-frequency Crystal
Oscillator, and Ceramic Resonator.
Figure 146 shows how each oscillator with external connection is supported in the scan
chain. The Enable signal is supported with a general Boundary-scan cell, while the
Oscillator/clock output is attached to an observe-only cell. In addition to the main clock,
the Timer2 Oscillator is scanned in the same way. The output from the internal RC
Oscillator is not scanned, as this oscillator does not have external connections.
Pxn
From System Pin
Previous
From
Cell
ShiftDR
0
1
ClockDR
D
FF1
Slew-rate limited
Q
Next
Cell
To
SRC
To System Logic
AT90CAN128
OCxn
ODxn
TWIEN
IDxn
PUExn
295