SC28L202 Philips Semiconductors, SC28L202 Datasheet - Page 27

• Manufacturer Part Number: SC28L202
• Description: Dual universal asynchronous receiver/transmitter DUART
• Manufacturer: Philips Semiconductors

Philips Semiconductors
SFSR(7:4) Reserved
SFSR(3) Status of loop back error check.
A “1” indicates a loop back error occurred, which will be entered for
interrupt arbitration.
It can be cleared by the processor by a write to this register with
D(3) equal to “1”.
SFSR(2:1) Certification of returned data as Valid (This feature
implies the transmitted data is being returned by the remote
receiver. )
Sets automatic checking of returned data. This mode stores
transmitted data and compares it to data returned from the remote
receiver. It is used where relative short delay times are available, up
TRR Test and Revision Register.
TRR(7) Test 2 Enable
Bypass divide by 16 counter in all TxC and RxC.
STCR – Scan Test Control Register.
STCR(0) Iddq Test – Turns off all pull–up devices on the I/O pins.
SES – System Enable Status Register, A and B
This register reports the enabled status of the several sub systems in the DUART. These systems are sometimes controlled by the state
machines of the receiver FIFOs.
EOS – Enhanced Operation Status Register
This register reports the status of the Enhanced operation in several sub systems in the DUART.
2000 Feb 10
TRR
Addr
77
Dual UART
Bit 7
Reserved
Bit 7
Test 2
BIT 7
Bit 7
Reserved
Set to 0
Bit 6
I/O Port
Operation
0 = Default
1 = Enhanced
BIT 6
Bit 6:0
Revision Code
Bit 6
Reserved
Set to 0
Bit 5
Reserved
BIT 5
Bit 5
Transmitter
Enabled
0 = No
1 = Yes
Bit 4
Counter/Timer
0 Clock Select
0 = Default
1 = Enhanced
BIT 4
Bit 4
Receiver
Enabled
0 = No
1 = Yes
21
Bit 3
Channel B
Rx/Tx
Clock
Selection
0 = Default
1 = Enhanced
to two characters in time . This mode will totally relieve the
processor of this task where certainty of transmission and reception
is required. The transmitted data is looped back by the remote
station with a half–bit time delay. The local transmitted data is
internally sent to the local receiver for comparison. An interrupt is
generated in the case of an error (data mismatch, parity or framing).
00 = The checking is disabled
01 = Return data is clocked in on rise of TxC
10 = Return data is clocked on of rise of TxCN
00 = Reserved
SFSR(0) Reserved
TRR [6:0] – Chip Revision Code
Indicates the revision of the chip. Initial code will be 0000000 . The
revision code bits (6:0) are hard wired. The default setting of the test
bits is all zero.
BIT 3
Bit 3
Watch Dog
Timer
0 = No
1 = Yes
Bit 2
Channel A
Rx/Tx
Clock
Selection
0 = Default
1 = Enhanced
BIT 2
Memory Test
Bit 2
Address
Recognition
0 = No
1 = Yes
Bit 1
Channel B
FIFO
Interrupt Level
Control
0 = Default
1 = Enhanced
BIT 1
Scan Test
Bit 1
Xon
0 = No
1 = Yes
Objective specification
SC28L202
Bit 0
Channel A FIFO
Interrupt Level
Control
0 = Default
1 = Enhanced
BIT 0
Iddq Test
Bit 0
Xoff
0 = No
1 = Yes