SC16C650B datasheet(29/51 Pages) PHILIPS

29 / 51 page

Philips Semiconductors

SC16C650B

UART with 32-byte FIFOs and IrDA encoder/decoder

Product data

Rev. 03 — 10 December 2004

29 of 51

9397 750 14451

[1]

Whenever any MSR bit 0:3 is set to logic 1, a Modem Status Interrupt will be generated.

7.9 Scratchpad Register (SPR)

The SC16C650B provides a temporary data register to store 8 bits of user

information.

7.10 Enhanced Feature Register (EFR)

Enhanced features are enabled or disabled using this register.

Bits 0 through 4 provide single or dual character software ﬂow control selection.

When the Xon1 and Xon2 and/or Xoff1 and Xoff2 modes are selected, the double

8-bit words are concatenated into two sequential numbers.

MSR[1]

∆DSR [1]

Logic0=No DSR change (normal default condition).

Logic1=The DSR input to the SC16C650B has changed state since

the last time it was read. A modem Status Interrupt will be generated.

MSR[0]

∆CTS [1]

Logic 0 = No CTS change (normal default condition).

Logic 1 = The CTS input to the SC16C650B has changed state since

the last time it was read. A modem Status Interrupt will be generated.

Table 21:

Modem Status Register bits description…continued

Bit

Symbol

Description

Table 22:

Enhanced Feature Register bits description

Bit

Symbol

Description

EFR[7]

Automatic CTS ﬂow control.

Logic0=Automatic CTS ﬂow control is disabled (normal default

condition).

Logic 1 = Enable Automatic CTS ﬂow control. Transmission will stop

when CTS goes to a logical 1. Transmission will resume when the CTS

pin returns to a logical 0.

EFR[6]

Automatic RTS ﬂow control. Automatic RTS may be used for hardware ﬂow

control by enabling EFR[6]. When Auto-RTS is selected, an interrupt will

be generated when the receive FIFO is ﬁlled to the programmed trigger

level and RTS will go to a logic 1 at the next trigger level. RTS will return to

a logic 0 when data is unloaded below the next lower trigger level

(programmed trigger level 1). The state of this register bit changes with the

status of the hardware ﬂow control. RTS functions normally when

hardware ﬂow control is disabled.

0 = Automatic RTS ﬂow control is disabled (normal default condition).

1 = Enable Automatic RTS ﬂow control.

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