AP513 ACROPACK
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 39 -
http://www.acromag.com
- 39 -
www.acromag.com
0
Data Terminal
Ready Output
Signal (DTR)
0= DTR* Not Asserted (Inactive)
1= DTR* Asserted (Active)
Not used on the AP513.
1
Ready to Send
Output Signal
(RTS)
0 = RTS* Not Asserted (Inactive)
1 = RTS* Asserted (Active)
2
DTR# or RTS#
for Auto Flow
Control
0 = Uses RTS# and CTS# pins for auto
hardware flow control.
1 = Uses DTR# and DSR# for auto hardware
flow control (not supported by the AP513).
3
Send Char
Immediate
0 = Send char immediate disabled (default).
1 = Send char immediate enabled.
4
Loop-back
0 = Loop-back Disabled
1 = Loop-back Enabled
5
1
Xon Control
0 = Disable Xon
1 = Enable any Xon function. In this mode
any RX character received will enable Xon.
6
1
Not Used
Must be logic 0
7
1
Divide by Four
0 = Divide by one. The internal 125MHz clock
is fed directly to the Programmable Baud
Rate Generator without further modification.
1 = Divide by four. 125MHz divided by 4, or
31.25MHz, is fed to the Programmable Baud
Rate Generator.
1
Bits 5-7 are
only programmable when the EFR bit 4 is set to “1”. The
programmed values for these bits are latched when EFR bit 4 is cleared,
preventing existing software from inadvertently overwriting the extended
functions. A power-up or system reset sets all MCR bits to 0.
3.4.9 Line Status Register (LSR)
–
Read Only
The Line Status Register (LSR) provides status indication corresponding to
the data transfer. LSR bits 1-4 are the error conditions that produce
receiver line-status interrupts (a priority 1 interrupt in the Interrupt
Identification Register).
