Maxim-integrated MAXQ622 Bedienungsanleitung PDF herunterladen (Seite 147)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 9-11

Bit 0: Receive Interrupt Flag (RI). This bit indicates that a data byte has been received in the serial port buffer. The

bit is set at the end of the 8th bit for mode 0, after the last sample of the incoming stop bit for mode 1 subject to the

value of the SM2 bit, or after the last sample of RB8 for modes 2 and 3. This bit must be cleared by software once set.

9.4.2 Serial Port Mode Register (SMD)

Bit 3: Enable Serial Port Interrupt (ESI). Setting this bit to 1 enables interrupt requests generated by the RI or TI flags

in SCON. Clearing this bit to 0 disables the serial port interrupt.

Bit 2: Serial-Port Baud-Rate Select (SMOD). The SMOD selects the final baud rate for the asynchronous mode:

1 = 16 times the baud clock for mode 1 and 3

32 times the system clock for mode 2

0 = 64 times the baud clock for mode 1 and 3

64 times the system clock for mode 2

Bit 0: Framing Error Detection Enable (FEDE). This bit selects the function of SM0 (SCON.7):

0 = SCON.7 functions as SM0 for serial-port mode selection

1 = SCON.7 is converted to the framing error (FE) flag

9.4.3 Serial Port Data Buffer Register (SBUF)

Data for serial port is read from or written to this location. The serial transmit and receive buffers are separate but both

are addressed at this location.

9.4.4 Serial Port Phase Register (PR)

This register is used to load and read the value in the phase register.

7 0

— — — — —-

Serial Port Mode Register (SMD)

0 0 0 0 0 0 0 0

Power-On Reset and System Resets

r r r r r rw rw rw Read (r), Write (w), or Special (s) access

7 0

Serial Port Data Buffer Register (SBUF)

Power-On Reset and System Resets

Read (r), Write (w), or Special (s) access

15 0

Serial Port Phase Register (PR)

Power-On Reset and System Resets

Read (r), Write (w), or Special (s) access

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Maxim-integrated MAXQ622 Bedienungsanleitung Seite 147