AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 110

• 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

Registers
110
AT90CAN128
Figure 47. 16-bit Timer/Counter Block Diagram
Note:
The Timer/Counter (TCNTn), Output Compare Registers (OCRnx), and Input Capture
Register (ICRn) are all 16-bit registers. Special procedures must be followed when
accessing the 16-bit registers. These procedures are described in the section “Access-
ing 16-bit Registers” on page 112. The Timer/Counter Control Registers (TCCRnx) are
8-bit registers and have no CPU access restrictions. Interrupt requests (abbreviated to
Int.Req. in the figure) signals are all visible in the Timer Interrupt Flag Register (TIFRn).
All interrupts are individually masked with the Timer Interrupt Mask Register (TIMSKn).
TIFRn and TIMSKn are not shown in the figure.
The Timer/Counter can be clocked internally, via the prescaler, or by an external clock
source on the Tn pin. The Clock Select logic block controls which clock source and edge
the Timer/Counter uses to increment (or decrement) its value. The Timer/Counter is
1. Refer to Figure 2 on page 4, Table 32 on page 72, and Table 41 on page 79 for
Timer/Counter
Timer/Counter
TCCRnA
OCRnB
OCRnC
OCRnA
TCNTn
ICRn
=
=
=
1 and 3
Direction
Count
Clear
pin placement and description.
Control Logic
TOP
=
TCCRnB
Values
BOTTOM
Fixed
TOP
ICFn (Int.Req.)
clk
Detector
(1)
Edge
=
Tn
0
OCFnA
(Int.Req.)
OCFnB
(Int.Req.)
OCFnC
(Int.Req.)
TOVn
(Int.Req.)
Clock Select
Generation
Generation
Generation
( From Prescaler )
Waveform
Waveform
Waveform
Canceler
TCCRnC
Detector
Noise
Edge
Comparator Ouput )
4250C–CAN–03/04
( From Analog
OCnA
OCnB
OCnC
ICPn
Tn