ADUC7025BCPZ32-RL7 AD [Analog Devices], ADUC7025BCPZ32-RL7 Datasheet - Page 64

• Manufacturer Part Number: ADUC7025BCPZ32-RL7
• Description: Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU
• Manufacturer: AD [Analog Devices]

ADuC7019/20/21/22/24/25/26/27
COMCON1 Register
Name
COMCON1
COMCON1 is the modem control register.
Table 51. COMCON1 MMR Bit Descriptions
Bit
7:5
4
3
2
1
0
COMSTA0 Register
Name
COMSTA0
COMSTA0 is the line status register.
Table 52. COMSTA0 MMR Bit Descriptions
Bit
7
6
5
4
3
2
1
0
Name
BI
FE
OE
TEMT
THRE
PE
DR
Name
LOOPBACK
PEN
STOP
RTS
DTR
Address
0xFFFF0710
Address
0xFFFF0714
Description
Reserved.
COMTX Empty Status Bit. Set automatically if
COMTX is empty. Cleared automatically when
writing to COMTX.
COMTX and COMRX Empty. Set automatically if
COMTX and COMRX are empty. Cleared automati-
cally when one of the register receives data.
Break Error. Set when SIN is held low for more than
the maximum word length. Cleared automatically.
Framing Error. Set when invalid stop bit. Cleared
automatically.
Parity Error. Set when a parity error occurs.
Cleared automatically.
Overrun Error. Set automatically if data is over-
written before being read. Cleared automatically.
Data Ready. Set automatically when COMRX is
full. Cleared by reading COMRX.
Description
Reserved.
Loop Back. Set by user to enable loop
back mode. In loop back mode, the
SOUT is forced high. The modem signals
are also directly connected to the status
inputs (RTS to CTS, DTR to DSR, OUT1 to
RI, and OUT2 to DCD). Cleared by user to
be in normal mode.
Parity Enable Bit. Set by user to transmit
and check the parity bit. Cleared by user
for no parity transmission or checking.
Stop Bit. Set by user to transmit 1.5 stop
bits if the word length is 5 bits or 2 stop
bits if the word length is 6 bits, 7 bits, or
8 bits. The receiver checks the first stop
bit only, regardless of the number of
stop bits selected. Cleared by user to
generate 1 stop bit in the transmitted
data.
Request To Send. Set by user to force the
RTS output to 0. Cleared by user to force
the RTS output to 1.
Data Terminal Ready. Set by user to force
the DTR output to 0. Cleared by user to
force the DTR output to 1.
Default Value
0x00
Default Value
0x60
Access
R/W
Access
R
Rev. A | Page 64 of 92
COMSTA1 Register
Name
COMSTA1
COMSTA1 is a modem status register.
Table 53. COMSTA1 MMR Bit Descriptions
Bit
7
6
5
4
3
2
1
0
COMSCR Register
Name
COMSCR
COMSCR is an 8-bit scratch register used for temporary
storage. It is also used in network addressable UART mode.
COMDIV2 Register
Name
COMDIV2
COMDIV2 is a 16-bit fractional baud divide register.
Table 54. COMDIV2 MMR Bit Descriptions
Bit
15
14:13
12:11
10:0
Name
DCD
RI
DSR
CTS
DDCD
TERI
DDSR
DCTS
Name
FBEN
FBM[1-0]
FBN[10-0]
Address
0xFFFF0718
Address
0xFFFF071C
Address
0xFFFF072C
Description
Data Carrier Eetect.
Ring Indicator.
Data Set Ready.
Clear To Send.
Delta DCD. Set automatically if DCD changed
state since COMSTA1 last read. Cleared automati-
cally by reading COMSTA1.
Trailing Edge RI. Set if NRI changed from 0 to 1
since COMSTA1 last read. Cleared automatically
by reading COMSTA1.
Delta DSR. Set automatically if DSR changed state
since COMSTA1 last read. Cleared automatically
by reading COMSTA1.
Delta CTS. Set automatically if CTS changed state
since COMSTA1 last read. Cleared automatically
by reading COMSTA1.
Description
Fractional Baud Rate Generator Enable Bit.
Set by user to enable the fractional baud
rate generator. Cleared by user to generate
baud rate using the standard 450 UART
baud rate generator.
Reserved.
M if FBM = 0, M = 4.
N.
Default Value
0x00
Default Value
0x00
Default Value
0x0000
Access
R
Access
R/W
Access
R/W