Z8018200ZCO Zilog, Z8018200ZCO Datasheet - Page 74

• Manufacturer Part Number: Z8018200ZCO
• Description: Z80182 ZIP APPLICATION BOARD
• Manufacturer: Zilog
• Series: Z180r
• Type: Microprocessorr

Specifications of Z8018200ZCO

• Contents: Circuit Board, Software and Documentation
• For Use With/related Products: Z80182
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Zilog
3-74
16550 MIMIC REGISTERS (Continued)
Modem Status Register
Bit 7 Data Carrier Detect
This bit must be written by the Z180 MPU.
Bit 6 Ring Indicator
This bit must be written by the Z180 MPU.
Bit 5 Data Set Ready
This bit must be written by the Z180 MPU.
Bit 4 Clear to Send
This bit must be written by the Z180
Bit 3 Delta Data Carrier Detect
This bit is set to 1 whenever the Data Carrier Detect bit
changes state. This bit is reset when the PC/XT/AT reads
the Modem Status Register.
Bit 2 Trailing Edge Ring Indicator
This bit is set to 1 on the falling edge of the Ring Indicator
bit. This bit is reset when the PC/XT/AT reads the Modem
Status Register.
Bit 1 Delta Data Set Ready
This bit is set to 1 whenever the Data Set Ready bit
changes state. This bit is reset when the PC/XT/AT reads
the Modem Status Register.
Bit 0 Delta Clear To Send
This bit is set to 1 whenever the Clear To Send bit changes
state. This bit is reset when the PC/XT/AT reads the Modem
Status Register.
D7 D6 D5 D4 D3 D2 D1 D0
0
(Z180 MPU Read Only, Address xxF7H)
0
(PC Read/Write, Address 07H)
Figure 79. Scratch Register
0
0
0
0
0
0
™
MPU.
Divisor Latch (LS)
P R E L I M I N A R Y
PS009801-0301
Scratch Register
Bits 7-0 Scratch Register
This register is used by the PC/XT/AT programmer for
temporary data storage. The Z180 MPU is able to read this
register. If the PC/XT/AT writes to this register, no interrupt
to the Z180 MPU is generated.
Divisor Latch (LS)
Bit 7-0 Divisor Latch Most Significant Byte (MS)
This register contains the Low order byte of the Baud rate
divisor. Writing to this register with the PC/XT/AT will
generate an interrupt to the Z180 MPU. It can then read the
Baud rate divisor and set up the application.
Divisor Latch (MS)
Bit 7-0 Divisor Latch Most Significant Byte (MS)
This register contains the High order byte of the Baud rate
divisor. Writing to this register with the PC/XT/AT will
generate an interrupt to the Z180 MPU. It can then read the
Baud rate divisor and set up the application.
(PC Read/Write, Address 00H and DLAB=1)
(PC Read/Write, Address 01H and DLAB=1)
D7 D6 D5 D4 D3 D2 D1 D0
0
D7 D6 D5 D4 D3 D2 D1 D0
0
(Z180 MPU Read Only, Address xxF9H)
(Z180 MPU Read Only, Address xxF8H)
0
0
Figure 81. Divisor Latch (MS)
Figure 80. Divisor Latch (LS)
0
0
0
0
0
0
0
0
0
0
0
0
Z
ILOG
Divisor Latch (MS)
Scratch Register
I
NTELLIGENT
DS971820600
Z80182/Z8L182
P
ERIPHERAL