HCS08 datasheet(205/316 Pages) NXP

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Serial Communications Interface (S08SCIV4)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

205

14.2.2

SCI Control Register 1 (SCIC1)

This read/write register is used to control various optional features of the SCI system.

321

SBR7

SBR6

SBR5

SBR4

SBR3

SBR2

SBR1

SBR0

Reset

000

100

Figure 14-5. SCI Baud Rate Register (SCIBDL)

Table 14-2. SCIBDL Field Descriptions

Field

Description

7:0

SBR[7:0]

Baud Rate Modulo Divisor — These 13 bits in SBR[12:0] are referred to collectively as BR, and they set the

modulo divide rate for the SCI baud rate generator. When BR = 0, the SCI baud rate generator is disabled to

reduce supply current. When BR = 1 to 8191, the SCI baud rate = BUSCLK/(16

BR). See also BR bits in

Table 14-1.

321

LOOPS

SCISWAI

RSRC

WAKE

ILT

Reset

000

Figure 14-6. SCI Control Register 1 (SCIC1)

Table 14-3. SCIC1 Field Descriptions

Field

Description

LOOPS

Loop Mode Select — Selects between loop back modes and normal 2-pin full-duplex modes. When LOOPS = 1,

the transmitter output is internally connected to the receiver input.

0 Normal operation — RxD and TxD use separate pins.

1 Loop mode or single-wire mode where transmitter outputs are internally connected to receiver input. (See

RSRC bit.) RxD pin is not used by SCI.

SCISWAI

SCI Stops in Wait Mode

0 SCI clocks continue to run in wait mode so the SCI can be the source of an interrupt that wakes up the CPU.

1 SCI clocks freeze while CPU is in wait mode.

RSRC

Receiver Source Select — This bit has no meaning or effect unless the LOOPS bit is set to 1. When

LOOPS = 1, the receiver input is internally connected to the TxD pin and RSRC determines whether this

connection is also connected to the transmitter output.

0 Provided LOOPS = 1, RSRC = 0 selects internal loop back mode and the SCI does not use the RxD pins.

1 Single-wire SCI mode where the TxD pin is connected to the transmitter output and receiver input.

9-Bit or 8-Bit Mode Select

0 Normal — start + 8 data bits (LSB first) + stop.

1 Receiver and transmitter use 9-bit data characters



start + 8 data bits (LSB first) + 9th data bit + stop.

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