Maxim Integrated MAXQ610 - Manual (Page 92)

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MAXQ610 User’s Guide
REGISTER DESCRIPTION
SMD0 (09h, 03h) Serial Port Mode Register 0
Initialization: This register is cleared to 00h on all forms of reset .
Read/Write Access: Unrestricted read/write .
SMD0.0 (FEDE0) Framing Error-Detection Enable. This bit selects the function of SM0 (SCON0 .7):
FEDE = 0: SCON0 .7 functions as SM0 for serial port mode selection .
FEDE = 1: SCON0 .7 is converted to the framing error (FE) flag .
SMD0.1 (SMOD0) Serial Port 0 Baud-Rate Select. The SMOD selects the final baud rate for the asynchro-
nous mode:
SMOD = 1: 16 times the baud clock for mode 1 and 3,
32 times the system clock for mode 2 .
SMOD = 0: 64 times the baud clock for mode 1 and 3,
64 times the system clock for mode 2 .
SMD0.2 (ESI0) Enable Serial Port 0 Interrupt. Setting this bit to 1 enables interrupt requests generated by
the RI or TI flags in SCON0 . Clearing this bit to 0 disables the serial port interrupt .
SMD0.7 to SMD0.3 Reserved . Reads return 0 .
PR1 (0Ah, 03h) Phase Register 1
Initialization: The phase register is cleared to 0000h on all forms of reset .
Read/Write Access: Unrestricted read/write .
PR1.15 to PR1.0 Phase Register 1 Bits 15:0. This register is used to load and read the 16-bit value in the
phase register that determines the baud rate for the serial port 1 .
SMD1 (0Bh, 03h) Serial Port Mode Register 1
Initialization: This register is cleared to 00h on all forms of reset .
Read/Write Access: Unrestricted read/write .
SMD1.0 (FEDE1) Framing Error-Detection Enable. This bit selects the function of SM0 (SCON1 .7):
FEDE = 0: SCON1 .7 functions as SM0 for serial port mode selection .
FEDE = 1: SCON1 .7 is converted to the framing error (FE) flag .
SMD1.1 (SMOD1) Serial Port 1 Baud-Rate Select . The SMOD selects the final baud rate for the asynchronous
mode:
SMOD = 1: 16 times the baud clock for mode 1 and 3, 32 times the system clock for mode 2 .
SMOD = 0: 64 times the baud clock for mode 1 and 3, 64 times the system clock for mode 2 .
SMD1.2 (ESI1) Enable Serial Port 1 Interrupt. Setting this bit to 1 enables interrupt requests generated by
the RI or TI flags in SCON1 . Clearing this bit to 0 disables the serial port interrupt .
SMD1.7 to SMD1.3 Reserved, read returns 0.