Rainbow-electronics AT90S2313 Manual de usuario descargar pdf (Pagina 48)

AT90S2313

0839I–AVR–06/02

UART Baud Rate Register –

UBRR

The UBRR Register is an 8-bit read/write register that specifies the UART Baud Rate

according to the formula on the previous page.

Analog Comparator The Analog Comparator compares the input values on the positive input AIN0 (PB0) and

the negative input PB1(AIN1). When the voltage on the positive input PB0 (AIN0) is

higher than the voltage on the negative input PB1 (AIN1), the Analog Comparator Out-

put, ACO is set (one). The comparator’s output can be set to trigger the Timer/Counter1

Input Capture function. In addition, the comparator can trigger a separate interrupt

exclusive to the Analog Comparator. The user can select interrupt triggering on compar-

ator output rise, fall or toggle. A block diagram of the comparator and its surrounding

logic is shown in Figure 37.

Figure 37. Analog Comparator Block Diagram

Analog Comparator Control

and Status Register – ACSR

• Bit 7 – ACD: Analog Comparator Disable

When this bit is set (one), the power to the Analog Comparator is switched off. This bit

can be set at any time to turn off the Analog Comparator. This will reduce power con-

sumption in active and Idle modes. When changing the ACD bit, the Analog Comparator

Interrupt must be disabled by clearing the ACIE bit in ACSR. Otherwise an interrupt can

occur when the bit is changed.

• Bit 6 – Res: Reserved Bit

This bit is a reserved bit in the AT90S2313 and will always read as zero.

Bit 76543210

$09 ($29) MSB LSB UBRR

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initialvalue00000000

Bit 76543210

$08 ($28) ACD – ACO ACI ACIE ACIC ACIS1 ACIS0 ACSR

Read/Write R/W R R R/W R/W R/W R/W R/W

Initialvalue00N/A00000

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Rainbow-electronics AT90S2313 Manual de usuario Pagina 48