SERC816 データシートの表示（PDF） - STMicroelectronics

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SERC816

SERCOS INTERFACE CONTROLLER

STMicroelectronics 

SERCON816

Table 1. SERCON816 I/O Port Function Summary (continued)

Signal(s)

RxD

RxC

RECACTN

TxD1

TxD6-2

TxC

IDLE

DMAREQT

Pin(s)

14

12

26

16

22,21,20,

18,17

13

25

39

DMAACKTN

41

ADMUX

BUSMODE0,

BUSMODE1

96

97,98

BUSWIDTH

99

BYTEDIR

100

INT0, INT1

SBAUD16

44,43

28

SBAUD

RxD

RxC

RECACTN

TxD1

TxD6-2

TxC

IDLE

TM0, TM1

29

14

12

26

16

22,21,20,

18,17

13

25

30,31

IO

Function

I Receive data for the serial interface.

O Receive clock for the serial interface. Output of the internally generated

receive clock.

O Receive active, active low. Indicates that the serial receiver is receiving a

telegram.

O Transmit data. The pin can be switched to a high impedance state.

O Transmit data or output port. The pins either output the serial data or can be

used as parallel output ports. When they output transmit data, each pin can be

switched to a high impedance state individually.

O Transmit clock for the serial interface. Output for the internally generated

transmit clock.

O Transmitter active, active low. When transmitting own data IDLE is 0.

O DMA request transmit, active high: becomes active when data can be written

to the transmit FIFO. DMAREQT becomes inactive again at the beginning of

the last write access to the transmit FIFO.

I DMA acknowledge transmit, active low: when DMAACKTN is 0, the transmit

FIFO is written to when there is a bus write access independent of the levels

on A6-1 and the chip select signals.

I Address data bus: when ADMUX is 0 A15-0 are the address inputs, when

ADMUX is 1 A15-0 are the outputs of the address latch.

I Bus mode: BUSMODE0 = 0 turns on the Intel bus interface (RDN = read,

WRN = write), BUSMODE0 = 1 selects the Motorola interface (RDN = data

strobe, WRN = read/write). BUSMODE1 selects the 0-active data strobe

(BUSMODE1 = 0) or the 1-active data strobe (BUSMODE1 = 1).

I Bus width: selects the 8-bit- (0) or the 16-bit-wide interface (1).

I Byte address sequence: when BYTEDIR is 0, A0 = 0 addresses the lower 8

bits of a word (low byte first), when BYTEDIR is 1, the upper 8 bits of a word

are addressed (high byte first).

O Interrupts, active low or active high. Interrupt sources and signal polarity are

programmable.

I Baud rate and SERCON410B compatible mode: SBAUD and SBAUD16

selects the baud rate for the serial interface. If SBAUD16 is ‘1’ the

SERCON410B compatible mode is selected.

I Baud rate. Can be overwritten by the microprocessor.

I Receive data for the serial interface.

O Receive clock for the serial interface. Output of the internally generated

receive clock.

O Receive active, active low. Indicates that the serial receiver is receiving a

telegram.

O Transmit data. The pin can be switched to a high impedance state.

O Transmit data or output port. The pins either output the serial data or can be

used as parallel output ports. When they output transmit data, each pin can be

switched to a high impedance state individually.

O Transmit clock for the serial interface. Output for the internally generated

transmit clock.

O Transmitter active, active low. When transmitting own data IDLE is 0.

I Turn on test generator: TM0 = 0 switches TxD1-6 to contiuous signal light,

TM1 = 0 switch-over to zero bit stream. The processor can overwrite the level

of TM1-0. Select repeater mode at reset time: TM1=0 and TM2=0 repeater

off, all other repeater on.

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