Z8018010VSG Datasheet, PDF (49/85 Pages) Zilog, Inc. – Microprocessor Unit

Z80180
Microprocessor Unit
43
Table 11. Data Formats
MOD2
0
0
0
0
1
1
1
1
MOD1
0
0
1
1
0
0
1
1
MOD0
0
1
0
1
0
1
0
1
Data Format
Start + 7 bit data + 1 stop
Start + 7 bit data + 2 stop
Start + 7 bit data + parity + 1 stop
Start + 7 bit data + parity + 2 stop
Start + 8 bit data + 1 stop
Start + 8 bit data + 2 stop
Start + 8 bit data + parity + 1 stop
Start + 8 bit data + parity + 2 stop
ASCI Channel Control Register B
ASCI Channel Control Register B
ASCI Control Register B 0 (CNTLB0: I/O Address = 02h)
ASCI Control Register B 1 (CNTLB1: I/O Address = 03h)
Bit
7
6
5
4
3
2
1
0
CTS/
MPBT MP
PS
PEO
DR
SS2
SS1
SS0
R/W
R/W R/W R/W
R/W
R/W R/W
R/W
Figure 33. ASCI Channel Control Register B
MPBT: Multiprocessor Bit Transmit (bit 7)—When multiprocessor communication format
is selected (MP bit = 1), MPBT is used to specify the MPB data bit for transmission. If MPBT
= 1, then MPB = 1 is transmitted. If MPBT = 0, then MPB = 0 is transmitted. MPBT state is
undefined during and after RESET.
MP: Multiprocessor Mode (bit 6)—When MP is set to 1, the data format is configured for
multiprocessor mode based on the MOD2 (number of data bits) and MOD0 (number of stop
bits) bits in CNTLA. The format is as follows.
Start bit + 7 or 8 data bits + MPB bit + 1 or 2 stop bits
Multiprocessor (MP=1) format does not feature any provision for parity.
If MP = 0, the data format is based on MOD0, MOD1, MOD2, and may include parity. The MP
bit is cleared to 0 during RESET.
CTS/PS: Clear to Send/Prescale (bit 5)—If bit 5 of the System Configuration Register
is 0, the CTS0/RxS pin features the CTS0 function, and the state of the pin can be read in bit 5
PS014004-1106
Architecture