OP7100
46 Hardware
CTS1E (CTS Enable, Channel 1)
The signals RXS and CTS1 are multiplexed on the same pin. A 1 stored in
this bit makes the pin serve the CTS1 function. A 0 selects the RXS
function. (The pin RXS is the CSI/O data receive pin.) When RXS is
selected, the CTS line has no effect.
RIE (Receiver Interrupt Enable)
A 1 enables receiver interrupts and 0 disables them. A receiver interrupt is
requested under any of the following conditions:
/DCD0
(Channel 0 only),
RDRF (read data register full), OVRN (overrun), PE (parity error), and FE
(framing error). The condition causing the interrupt must be removed be-
fore the interrupts are re-enabled, or another interrupt will occur. Reading
the receiver data register (RDR) clears the RDRF flag. The EFR bit in
CNTLA is used to clear the other error flags.
FE (Framing Error)
A stop bit was missing, indicating scrambled data. This bit is cleared by the
EFR bit in CNTLA.
PE (Parity Error)
Parity is tested only if MOD1 in CNTLA is set. This bit is cleared by the
EFR bit in CNTLA.
OVRN (Overrun Error)
Overrun occurs when bytes arrive faster than they can be read from the
receiver data register. The receiver shift register (RSR) and receiver data
register (RDR) are both full. This bit is cleared by the EFR bit in CNTLA.
RDRF (Receiver Data Register Full)
This bit is set when data is transferred from the receiver shift register to the
receiver data register. It is set even when one of the error flags is set, in
which case defective data is still loaded to RDR. The bit is cleared when
the receiver data register is read, when the
/DCD0
input pin is high, and by
RESET and IOSTOP.
Summary of Contents for OP7100
Page 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 070831 O ...
Page 10: ...OP7100 x About This Manual ...
Page 16: ...OP7100 16 Overview ...
Page 74: ...OP7100 74 Software ...
Page 82: ...OP7100 82 Graphics Programming ...
Page 88: ...OP7100 88 Installation ...
Page 98: ...OP7100 98 Specifications ...
Page 108: ...OP7100 108 Memory I O Map and Interrupt Vectors ...
Page 112: ...112 Serial Interface Board 2 OP7100 ...
Page 113: ...OP7100 Backup Battery 113 APPENDIX E BACKUP BATTERY ...
Page 116: ...OP7100 116 Backup Battery ...
Page 124: ...OP7100 124 Index ...
Page 126: ...XX0000 Schematics ...