ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64(L)

Special Function IO Register –

SFIOR

Bit

7

6

5

4

3

2

1

0

TSM

–

–

–

ACME

PUD

PSR0 PSR321 SFIOR

Read/Write

R/W

R

R

R

R/W

R/W

R/W

R/W

Initial Value

0

0

0

0

0

0

0

0

• Bit 7 – TSM: Timer/Counter Synchronization Mode

Writing TSM bit to one activates the Timer/Counter Synchronization mode. In this mode,

the value that is written to PSR0 and PSR321 bits is kept, hence keeping the corre-

sponding prescaler reset signals asserted. This ensures that the corresponding

Timer/Counters are halted and can be configured to the same value without the risk of

one of them advancing during configuration. When the TSM bit written zero, the PSR0

and PSR321 bits are cleared by hardware, and the Timer/Counters start counting

simultaneously.

• Bit 1 – PSR0: Prescaler Reset Timer/Counter0

When this bit is one, the Timer/Counter0 prescaler will be reset. The bit is normally

cleared immediately by hardware. If this bit is written when Timer/Counter0 is operating

in Asynchronous mode, the bit will remain one until the prescaler has been reset. The bit

will not be cleared by hardware if the TSM bit is set.

2490G–AVR–03/04

109

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