DS89C420-QCL Datasheet, PDF (28/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
Slave Address Register 1 (SADDR1)
7
6
5
SFR AAh
SADDR1.7 SADDR1.6 SADDR1.5
RW-0
RW-0
RW-0
R = Unrestricted read, W = Unrestricted write, -n = Value after reset
4
SADDR1.4
RW-0
3
SADDR1.3
RW-0
2
SADDR1.2
RW-0
1
SADDR1.1
RW-0
0
SADDR1.0
RW-0
SADDR1.7–0
Bits 7–0
Slave Address Register 1. This register is programmed with the given or broadcast address
assigned to serial port 1.
Port 3 (P3)
7
6
5
SFR B0h
P3.7
RD
P3.6
WR
P3.5
T1
RW-1
RW-1
RW-1
R = Unrestricted read, W = Unrestricted write, -n = Value after reset
4
P3.4
T0
RW-1
3
P3.3
INT1
RW-1
2
P3.2
INT0
RW-1
1
P3.1
TXD0
RW-1
0
P3.0
RXD0
RW-1
P3.7–0
Bits 7–0
RD
Bit 7
WR
Bit 6
T1
Bit 5
T0
Bit 4
INT1
Bit 3
INT0
Bit 2
TXD0
Bit 1
RXD0
Interrupt Priority 1 (IP1)
Purpose I/O Port 3. This register functions as a general-purpose I/O port. In addition, all the pins
have an alternative function listed below. Each of the functions is controlled by several other SFRs.
The associated port 3 latch bit must contain a logic 1 before the pin can be used in its alternate
function capacity.
External Data Memory Read Strobe. This pin provides an active-low read strobe to an external
memory device.
External Data Memory Write Strobe. This pin provides an active-low write strobe to an external
memory device.
Timer/Counter External Input. A 1-to-0 transition on this pin increments Timer 1.
Counter External Input. A 1-to-0 transition on this pin increments Timer 0.
External Interrupt 1. A falling edge/low level on this pin causes an external interrupt 1 if enabled.
External Interrupt 0. A falling edge/low level on this pin causes an external interrupt 0 if enabled.
Serial Port 0 Transmit. This pin transmits the serial port 0 data in serial port modes 1, 2, 3 and
emits the synchronizing clock in serial port mode 0.
Serial Port 0 Receive. This pin receives the serial port 0 data in serial port modes 1, 2, 3 and is a
SFR B1h
7
6
5
—
MPS1
MPT2
R-1
RW-0
RW-0
R = Unrestricted read, W = Unrestricted write, -n = Value after reset
4
MPS0
RW-0
3
MPT1
RW-0
2
MPX1
RW-0
1
MPT0
RW-0
0
MPX0
RW-0
Bit 0
IP17.0
Bit 7
MPS1
Bit 6
bidirectional data transfer pin in serial port mode 0.
Reserved. Read data is 1.
Most Significant Priority Select Bit for Serial Port 1 Interrupt. This is the most significant bit of
the bit pair MPS1, LPS1 (IP0.6) that designates priority level for the serial port 1 interrupt.
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