NS486SXL-25 National Semiconductor, NS486SXL-25 Datasheet - Page 13

• Manufacturer Part Number: NS486SXL-25
• Description: IC NS486SXL 132PQFP
• Manufacturer: National Semiconductor

Specifications of NS486SXL-25

• Processor Type: 486SX
• Speed: 25MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Other names: *NS486SXL-25

Symbol
T0
T1
SO DCD
SI CTS
SCLK RI
Symbol
2 0 Pin Description Tables
Pins
Pins
1
1
1
1
1
Type
I O
I O
Type
I O
I O
I O
O
I
I
I
Programmer Timer pin 0 This Bidirectional pin may be selected to control one of the following four
functions via bits 1–0 of the Timer I O Control Register
1 The GATE input into Timer 0
2 The GATE input into Timer 1
3 The OUT output from Timer 0
4 The CLK input into Timer 1
Programmable Timer pin 1 This Bidirectional pin may be selected to control one of the following four
functions via bits 3–2 of the Timer I O Control Register
1 The GATE input into Timer 0
2 The GATE input into Timer 1
3 The OUT output from Timer 1
4 The CLK input into Timer 0
This pin has two possible programmable options controlled by the Modem Signal Control Register
(refer to the UART section)
1 The serial data Output signal for MICROWIRE or the serial data I O for Access bus
2 Data Carrier Detect When low this input signal indicates that the data carrier has been detected by
Note Whenever the DCD bit of the MODEM Status Register changes state an interrupt is generated if the MODEM Status
This pin has two possible programmable options controlled by the Modem Signal Control Register
(refer to the UART section)
1 The Serial data Input signal for MICROWIRE
2 Clear To Send When low this input signal indicates that the MODEM or data set is ready to
Note Whenever the CTS bit of the MODEM Status Register changes state an interrupt is generated if the MODEM Status
This pin has two possible programmable options controlled by the Modem Signal Control Register
(refer to the UART section)
1 The Serial CLocK signal for MICROWIRE and Access bus
2 Ring Indicator When low this input signal indicates that a telephone ringing signal has been
Note Whenever the CTS bit of the MODEM Status Register changes state an interrupt is generated if the MODEM Status
Note Whenever the RI bit of the MODEM Status Register changes from a high to a low state an interrupt is generated if the
the MODEM or data set The DCD signal is a MODEM status input whose condition can be tested by
the CPU reading bit 7 (DCD) of the MODEM Status Register Bit 7 is the complement of the DCD
signal Bit 3 (DDCD) of the MODEM Status Register indicates whether the DCD input has changed
state since the previous reading of the MODEM Status Register DCD has no effect on the receiver
exchange data The CTS signal is a MODEM status input whose conditions can be tested by the
CPU reading bit 4 (CTS) of the MODEM Status Register Bit 4 is the complement of the CTS signal
Bit 0 (DCTS) of the MODEM Status Register indicates whether the CTS input has changed state
since the previous reading of the MODEM Status Register CTS has no effect on the Transmitter
received by the MODEM or data set The RI signal is a MODEM status input whose condition can be
tested by the CPU reading bit 6 (RI) of the MODEM Status Register Bit 6 is the complement of the RI
signal Bit 2 (TERI) of the MODEM Status Register indicates whether the RI input signal has
changed from a low to high state since the previous reading of the MODEM Status Register
Interrupt is enabled
Interrupt is enabled
Interrupt is enabled
MODEM Status Interrupt is enabled
(Continued)
TABLE 2-16 3-Wire Serial I O Pins
TABLE 2-15 Timer Pins
13
Function
Function