Serial Status And Data Register (Ssd); Serial Status And Rate Register (Ssd) - Fujitsu Semiconductor Controller MB89950/950A Hardware Manual

10.4.3

Serial Status and Data Register (SSD)

The serial status and data register (SSD) is used to set and monitor transmit/receive
operation and error status.
I Serial status and rate register (SSD)
Address Bit 7
0022 RDRF
H
R
R/W : Readable and writable
: Read-only
R
: Unused
X : Indeterminate
—
: Initial value
Figure 10.4-4 Serial status and data register (SSD)
Bit 6 Bit 5 Bit 4 Bit 3
ORFE TDRE TIE RIE
R R R/W R/W
Bit 2 Bit 1 Bit 0 Initial value
TD8/TP RD8/RP 00100-1X
R/W R
RD8/RP Received data parity selection bit
0
1
TD8/TP Transmitted data parity selection bit
0
1
RIE Receiver interrupt enable bit
0
1
TIE Transmitter interrupt enable bit
0
1
TDRE Transmission data register empty bit
0 Full of transmission data
1
Receive data flag bit/Error flag bit
RDRF ORFE
0 0
0 1 (When new data is received at
this state, RDRF will not be set)
1 0
Overrun error (Previous data
1 1
CHAPTER 10 UART
B
Odd parity
Even parity
Odd parity
Even parity
Disables interrupt
Enables interrupt
Disables interrupt
Enables interrupt
Empty
No data
Framing error
Normal data
remains)
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