Rainbow-electronics ATmega64M1 Bedienungsanleitung PDF herunterladen (Seite 150)

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8209A–AVR–08/09

ATmega16M1/32M1/64M1

18.16.6 POCRnRBH and POCRnRBL – PSC Output Compare RB Register

Note : n = 0 to 2 according to module number.

The Output Compare Registers RA, RB, SA and SB contain a 12-bit value that is continuously

compared with the PSC counter value. A match can be used to generate an Output Compare

interrupt, or to generate a waveform output on the associated pin.

The Output Compare Registers are 16bit and 12-bit in size. To ensure that both the high and low

bytes are written simultaneously when the CPU writes to these registers, the access is per-

formed using an 8-bit temporary high byte register (TEMP). This temporary register is shared by

all the other 16-bit registers.

18.16.7 PCNF – PSC Configuration Register

• Bit 7:6 – Res: Reserved

These bits are reserved and will always read as zero.

• Bit 5 – PULOCK: PSC Update Lock

When this bit is set, the Output Compare Registers POCRnRA, POCRnSA, POCRnSB,

POCR_RB and the PSC Output Configuration Registers POC can be written without disturbing

the PSC cycles. The update of the PSC internal registers will be done if the PULOCK bit is

released to zero.

• Bit 4 – PMODE PSC Mode

Select the mode of PSC.

• Bit 3 – POPB: PSC B Output Polarity

If this bit is cleared, the PSC outputs B are active Low.

If this bit is set, the PSC outputs B are active High.

• Bit 2 – POPA: PSC A Output Polarity

If this bit is cleared, the PSC outputs A are active Low.

If this bit is set, the PSC outputs A are active High.

Bit 76543210

–––– POCRnRB[11:8] POCRnRBH

POCRnRB[7:0] POCRnRBL

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

Initial Value 00000000

Bit 76543210

PULOCK PMODE POPB POPA -

PCNF

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

Initial Value 0 0 0 0 0 0 0 0

Table 18-10. PSC Mode Selection

PMODE Description

0 One Ramp Mode (Edge Aligned)

1 Center Aligned Mode

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 342 343

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Rainbow-electronics ATmega64M1 Bedienungsanleitung Seite 150