AP513 ACROPACK
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 46 -
http://www.acromag.com
- 46 -
www.acromag.com
1 = Enables the enhanced functions. Allows the
IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and MCR
bits 5-7 to be modified.
5
Special
Character
Detect
Control
0 = Disable special character detect.
1 = Enable special character detect. Incoming
receive characters are compared with Xoff-2
data. If a match exists, the receive data will be
transferred to FIFO and ISR bit-4 will be set to
indicate detection of special character. Bit-0
of the Xoff/Xon registers corresponds with the
LSB bit for the receive character. When this
feature is enabled, the normal software flow
control must be disabled (EFR bits 0-3 must be
set to a logic “0”).
6
RTS
Hardware
Flow
Control
0 = Disable Automatic RTS flow control.
1= Enable Automatic RTS flow control. The RTS
pin can be automatically controlled to indicate
local buffer overflows to remote buffers.
When automatic hardware flow control is
enabled, an interrupt will be generated when
the receive FIFO is filled to the program trigger
level and RTS will go to a logic “1” at the next
trigger level. RTS will return to a logic “0”
when data is unloaded below the next lower
trigger level. RTS functions normally when
hardware flow control is disabled. FCTR bits0-
1 are used to set the RTS delay timer/trigger
level.
7
CTS
Hardware
Flow
Control
0 = Disable Automatic CTS flow control.
1 = Enable Automatic CTS flow control. The CTS
pin can be monitored for remote buffer
overflow indication. When automatic CTS
hardware flow control is enabled, a CTS
transition from logic “0” to a logic “1” to
indicate a flow control request, ISR bit-5 will be
set to a logic “1” (if enabled via IER bit6
-7), and
transmission of data will be suspended as soon
as the stop bit of the character in process is
shifted out. Transmission is resumed after the
CTS input returns to a logic “0”, indicating
more data may be sent.
The CTS and RTS signals are available on the AP513 model.