HD64570 Datasheet, PDF (425/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Register
MSCI (Channel 0)
MSCI Command Register
Channel 0: CMD
Channel 0
Not used
MSCI Mode Register 0
Channel 0: MD0
Channel 0
Address
CPU CPU
Mode Mode
0, 1 2, 3
2CH 2DH
2DH 2CH
2EH 2FH
Remarks
7
Async
—*1
Byte sync
Bit sync HDLC
Read/Write
—
Initial value
—
6
5
4
3
2
1
0
—*1 CMD5 CMD4 CMD3 CMD2 CMD1 CMD0
—WWWWWW
———————
Command
• Transmit commands
000001: TX reset
000010: TX enable
000011: TX disable
000100: TX CRC initialization
000101: TX CRC calculation
exclusion
000110: End-of-message
000111: Abort transmission
001000: MP bit on
001001: TX buffer clear
Others: Reserved
• Receive commands
010001: RX reset
010010: RX enable
010011: RX disable
010100: RX CRC initialization
010101: Message reject
010110: Search MP bit
010111: RX CRC calculation
exclusion
011000: Forcing RX CRC
calculation
• Other commands
100001: Channel reset
110001: Enter search mode
000000: No operation
7
6
5
4
3
2
1
0
Async
PRTCL2PRTCL1PRTCL0AUTO —
— STOP1 STOP0
Byte sync
CRCCCCRC1 CRC0
Bit sync HDLC
Read/Write R/W R/W R/W R/W — R/W R/W R/W
Initial value
0
0
0
0
0
0
0
0
Protocol mode
000: Asynchronous mode
001: Byte-sync
mono-sync mode
010: Byte-sync
Bi-sync mode
011: Byte-sync external
synchronous mode
100: Bit-sync HDLC mode
101: Reserved
110: Reserved
111: Reserved
Auto-enable
0: Auto-enable reset
1: Auto-enable set
CRC code caluculation
• Byte/Bit synchronous
mode
0: Disable
1: Enable
Stop bit length
• Asynchronous mode
00: 1 bit
01: 1.5 bits
10: 2 bits
11: Reseved
CRC calcuration
expression and
initial value
• Byte/Bit synchronous mode
0X: CRC-16
1X: CRC-CCITT
X0: Initial value = all 0s
X1: Initial value = all 1s
Rev. 0, 07/98, page 409 of 453