scn2661 NXP Semiconductors, scn2661 Datasheet - Page 10

• Manufacturer Part Number: scn2661
• Description: Enhanced Programmable Communications Interface Epci
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 5. Mode Register 1 (MR1)
NOTE: Baud rate factor in asynchronous applies only if external clock is selected. Factor is 16X if internal clock is selected. Mode must be
Table 6. Mode Register 2 (MR2)
NOTES:
*
E = External clock
I
1X and 16X are clock outputs.
Table 7. Command Register (CR)
1994 Apr 27
00 = Normal operation
01 = Async:
10 = Local loopback
11 = Remote loopback
Async: Stop bit length
00 = invalid
01 = 1 stop bit
10 = 1 1/2 stop bits
11 = 2 stop bits
Sync:
Number of
SYN char
0 = Double SYN
1 = Single SYN
Enhanced programmable communications
interface (EPCI)
0000
0001
0010
0011
0100
0101
0110
0111
When pin 9 is programmed as XSYNC input, SYN1, SYN1–SYN2, and DLE–SYN1 detection is disabled.
= Internal clock (BRG)
CR7
Automatic
Echo mode
Sync: SYN and/or DLE
stripping mode
MR17
selected (MR11, MR10) in any case.
Operating Mode
Sync/Async
TxC
E
E
E
E
I
I
I
I
Sync:
Transparency
control
0 = Normal
1 = Transparent
CR6
MR16
RxC
E
E
E
E
I
I
I
I
0 = Force RTS
1 = Force RTS
Pin 9
TxC
TxC
TxC
TxC
16X
16X
1X
1X
Request
Output High
one clock
time after
TxSR
serialization
output Low
to Send
Parity Type
CR5
0 = Odd
1 = Even
MR15
Pin 25
RxC
RxC
RxC
RxC
16X
16X
1X
1X
0 = Normal
1 = Reset error
MR27 – MR24
Reset Error
Parity Control
0 = Disabled
1 = Enabled
flags in
status reg.
(FE,OE,PE/
DLE detect.)
1000
1001
1010
1011
1100
1101
1110
1111
CR4
MR14
10
TxC
E
E
E
E
I
I
I
I
Async:
Force Break
0 = Normal
1 = Force
break
Sync
Send DLE
0 = Normal
1 = Send DLE
Sync/Async
MR13
CR3
Character Length
RxC
E
E
E
E
I
I
I
I
00 = 5 bits
01 = 6 bits
10 = 7 bits
11 = 8 bits
0 = Disable
1 = Enable
Not applicable
XSYNC*
XSYNC*
XSYNC*
XSYNC*
Pin 9
TXC
TxC
16X
1X
Receive
Control
(RxEN)
MR12
CR2
in
SCN2661/SCN68661
RXC/TxC
RxC/TxC
BKDET
BKDET
BKDET
BKDET
Pin 25
RxC
RxC
0 = Force DTR
1 = Force DTR
Data Terminal
Mode and Baud Rate Factor
00 = Synchronous 1X rate
01 = Asynchronous 1X rate
10 = Asynchronous 16X rate
11 = Asynchronous 64X rate
output High
output Low
Ready
MR11
CR1
Mode
async
async
async
async
sync
sync
sync
sync
Product specification
See baud rates
0 = Disable
1 = Enable
MR23 – MR20
Baud Rate
in Table 1.
Selection
Transmit
Control
(TxEN)
MR10
CR0