Datasheet

ADuC7033
Rev. B | Page 110 of 140
UART Control Register 0
Name: COMCON0
Address: 0xFFFF070C
Default Value: 0x00
Access: Read/write
Function: This 8-bit register controls the operation of the UART in conjunction with COMCON1.
Table 81. COMCON0 MMR Bit Designations
Bit Name Description
7 DLAB Divisor Latch Access.
Set by user to enable access to COMDIV0 and COMDIV1 registers.
Cleared by user to disable access to COMDIV0 and COMDIV1 and enable access to COMRX,
COMTX, and COMIEN0.
6 BRK Set Break.
Set by user to force TxD to 0.
Cleared to operate in normal mode.
5 SP Stick Parity. Set by user to force parity to defined values.
1 if EPS = 1 and PEN = 1.
0 if EPS = 0 and PEN = 1.
4 EPS Even Parity Select Bit.
Set for even parity.
Cleared for odd parity.
3 PEN Parity Enable Bit.
Set by user to transmit and check the parity bit.
Cleared by user for no parity transmission or checking.
2 STOP Stop Bit.
Set by the user to transmit 1.5 stop bits if the word length is 5 bits, or 2 stop bits if the word length
is 6, 7, or 8 bits. The receiver checks the first stop bit only, regardless of the number of stop bits
selected.
Cleared by the user to generate one stop bit in the transmitted data.
1 to 0 WLS Word Length Select.
00 = 5 bits.
01 = 6 bits.
10 = 7 bits.
11 = 8 bits.