
MOTOROLA
Appendix - B Programmer’s Sheets
B-71
Preliminary
Application:
Date:
Programmer:
Sheet
B
ESSI Control Register 2 (SCR2)
5 of 16
Bits
Name
Description
15
RIE
Receive Interrupt Enable
This control bit allows interrupting the program controller
0
Receive FIFO is disabled: No interrupt is generated
1
Receive FIFO is disabled: Interrupt is generated if the RDR flag in the SSR is set
0
Receive FIFO is enabled: No interrupt is generated
1
Receive FIFO is enabled: Interrupt is generated if the RFF flag in the SSR is set
14
TIE
Transmit Interrupt Enable
This control bit provides program controller interruption
0
Transmit FIFO is disabled: No interrupt is generated
1
Transmit FIFO is disabled: Interrupt is generated if the TDE flag in the SSR is set
0
Transmit FIFO is enabled: No interrupt is generated
1
Transmit FIFO is enabled: Interrupt is generated if the TFE flag in the SSR is set
13
RE
Receive Enable
This control bit enables the receive portion of the ESSI
0
Receiver is disabled by inhibiting data transfer into the SRX
1
Receiver portion of the ESSI is enabled and received data will be processed
beginning with the next frame sync
12
TE0
Transmit Enable 0
This control bit enables the transfer of the contents of the STX0 register to its TXSR0
0
The transmitter continues to send data in TXSRO, then transmitter is disabled
1
On the next frame boundary, the transmit 0 portion of the ESSI is enabled
11
TE1
Transmit Enable 1
This control bit enables the transfer of the contents of the STX1 register to its TXSR1
0
Transmitter continues to send data currently in TXSR1, then disables transmitter
1
On the next frame boundary, the transmit 1 portion of the ESSI is enabled
10
TE2
Transmit Enable 2
This control bit enables the transfer of the contents of the STX2 register to its TXSR2
0
Transmitter continues to send data currently in TXSR2, then disables transmitter
1
On the next frame boundary, the transmit 2 portion of the ESSI is enabled
ESSI Control
Register 2 (SCR2)
Base + $5
Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
RIE
TIE RE TE0 TE1 TE2
SYN TSHFD TSCKP ESSIEN NET TFSI TFSL TEFS
Write
RESET
00000
0
ESSI
denotes Reserved Bits
See the following page for continuation of this register