MC9S08GB60 Datasheet, PDF (178/290 Pages) Motorola, Inc – Microcontrollers

Serial Communications Interface (SCI) Module
Read:
Write:
Reset:
Bit 7
6
0
0
5
4
3
2
0
SBR12 SBR11 SBR10
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 11-5. SCI Baud Rate Register (SCIxBDH)
1
SBR9
0
Bit 0
SBR8
0
Bit 7
6
5
4
3
2
Read:
SBR7
Write:
SBR6
SBR5
SBR4
SBR3
SBR2
Reset: 0
0
0
0
0
1
= Unimplemented or Reserved
Figure 11-6. SCI x Baud Rate Register (SCIxBDL)
1
SBR1
0
Bit 0
SBR0
0
SBR12:SBR0 — Baud Rate Modulo Divisor
These 13 bits 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).
11.10.2 SCI x Control Register 1 (SCIxC1)
This read/write register is used to control various optional features of the SCI system.
Bit 7
6
5
4
3
2
Read:
LOOPS SCISWAI RSRC
M
WAKE ILT
Write:
Reset:
0
0
0
0
0
0
Figure 11-7. SCI x Control Register 1 (SCIxC1)
1
Bit 0
PE
PT
0
0
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.
1 = Loop mode or single-wire mode where transmitter outputs are internally connected to receiver
input. (See RSRC bit.) RxD1 pin is not used by SCI.
0 = Normal operation — RxD1 and TxD1 use separate pins.
MC9S08GB/GT Data Sheet, Rev. 2.3
178
Freescale Semiconductor