NS486SXL NSC [National Semiconductor], NS486SXL Datasheet - Page 13

• Manufacturer Part Number: NS486SXL
• Description: Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems
• Manufacturer: NSC [National Semiconductor]

RI
T0
T1
SO
SI
SCLK
2.0 SXL Pin Description Tables
Note 1: For MICROWIRE Slave Mode, a pin must be selected to be the Chip Select Input.
Symbol
Symbol
Symbol
Pins
Pins
Pins
27
31
32
18
19
20
TABLE 13. Timer Pins
Type
Type
Type
I/O
I/O
I/O
I/O
O
I
TABLE 12. 16550 UART Pins (Continued)
TABLE 14. 3-Wire Serial I/O Pins
Ring Indicator. When low, this input signal indicates that a telephone ringing
signal has been received by the MODEM or data set. The RI signal is a MODEM
status input whose condition can be tested by 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.
Programmable 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.
The Serial data Output signal for MICROWIRE.
The Serial data Input signal for MICROWIRE or the serial data I/O for Access.bus.
The Serial CLocK signal for MICROWIRE and Access.bus.
Note: Whenever the CTS bit of the MODEM Status Register changes state, an interrupt is generated
Note: Whenever the RI bit of the MODEM Status Register changes from a high to a low state, an in-
(Continued)
if the MODEM Status Interrupt is enabled.
terrupt is generated if the MODEM Status Interrupt is enabled.
13
Function
Function
Function
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