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13-21
SYNCHRONOUS SERIAL I/O UNIT
13.3.5 SSIO Baud-rate Count Down Register (SSIOCTR)
Read SSIOCTR to determine the status of the baud-rate generator. The down counter is reloaded
when CV6:0 reaches zero or when a new value is written to SSIOBAUD.
Figure 13-19. SSIO Baud-rate Count Down Register (SSIOCTR)
13.3.6 SSIO Control 1 Register (SSIOCON1)
SSIOCON1 contains both transmit and receive control and status bits. Use the control bits to en-
able the receiver and transmitter and to connect the transmit buffer empty and receive buffer full
signals to the interrupt control unit. The status bits indicate that the transmit buffer is empty, a
transmit underrun error occurred, the receive buffer is full, or a receive overflow error occurred.
Both the transmit buffer empty and the receive buffer full signals can be connected (ORed) to the
interrupt request source (SSIOINT). When an interrupt request from this source is detected, you
can determine which signal caused the request by reading the SSIOCON1 receive buffer full and
transmit buffer empty status bits.
Baud-rate Count Down
SSIOCTR
(read only)
Expanded Addr:
ISA Addr:
Reset State:
F48AH
—
00H
7 0
BSTAT CV6 CV5 CV4 CV3 CV2 CV1 CV0
Bit
Number
Bit
Mnemonic
Function
7 BSTAT Baud-rate Generator Status:
0 = The baud-rate generator is disabled.
1 = The baud-rate generator is enabled.
6–0 CV6:0 Current Value:
These bits indicate the current value of the baud-rate down counter.