HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 132

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

Bit 7 (NRZFM: NRZ/FM Select): Used in conjunction with the CODE1 CODE0 bits (below) to
specify the transmission code type (NRZ or FM). This bit specifies MSCI decoding and encoding
types. Only the NRZ type is available in asynchronous mode.
Bits 6 5 (CODE1 CODE0: Transmission Code Type): Used in conjunction with the NRZFM
bit (above) to specify the transmission/reception signal decoding and encoding type. Only the
NRZ type is available in asynchronous mode.
Bits 4 3 (DRATE1 DRATE0: ADPLL Operating Clock/Bit Rate): Specify the ratio of the
ADPLL operating clock frequency to the bit rate in byte or bit synchronous mode.
Bits 1 0 (CNCT1 CNCT0: Channel Connection): The functions of these bits are described
below.
Rev. 0, 07/98, page 116 of 453
Asynchronous mode
Reserved. This bit always reads 0 and must be set to 0.
Byte synchronous/Bit synchronous mode
NRZFM = 0: Specifies NRZ transmission code type
NRZFM = 1: Specifies FM transmission code type
Asynchronous mode
Reserved. These bits always read 0 and must be set to 0.
Byte synchronous/Bit synchronous mode
NRZFM = 0: NRZ transmission code type
NRZFM = 1: FM transmission code type
Asynchronous mode
Reserved. These bits always read 0 and must be set to 0.
Byte synchronous/Bit synchronous mode
DRATE1, DRATE0 = 0, 0: ADPLL operating clock frequency = bit rate 8
DRATE1, DRATE0 = 0, 1: ADPLL operating clock frequency = bit rate 16
DRATE1, DRATE0 = 1, 0: ADPLL operating clock frequency = bit rate 32
DRATE1, DRATE0 = 1, 1: Reserved
CODE1, CODE0 = 0, 0: Specifies the NRZ transmission code type
CODE1, CODE0 = 0, 1: Specifies the NRZI transmission code type
CODE1, CODE0 = 1, 0: Reserved
CODE1, CODE0 = 1, 1: Reserved
CODE1, CODE0 = 0, 0: Specifies the Manchester transmission code type
CODE1, CODE0 = 0, 1: Specifies the FM1 transmission code type
CODE1, CODE0 = 1, 0: Specifies the FM0 transmission code type
CODE1, CODE0 = 1, 1: Reserved