Datasheet

Memory
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
26 Freescale Semiconductor
$0017
SCI Status Register 2
(SCS2)
See page 132.
Read:000000BKFRPF
Write:
Reset:00000000
$0018
SCI Data Register
(SCDR)
See page 133.
Read: R7 R6 R5 R4 R3 R2 R1 R0
Write: T7 T6 T5 T4 T3 T2 T1 T0
Reset: Unaffected by reset
$0019
SCI Baud Rate Register
(SCBR)
See page 133.
Read: 0 0
SCP1 SCP0 R SCR2 SCR1 SCR0
Write:
Reset:00000000
$001A
Keyboard Status and
Control Register (KBSCR)
See page 99.
Read:0000KEYF0
IMASKK MODEK
Write:
ACKK
Reset:00000000
$001B
Keyboard Interrupt Enable
Register (KBIER)
See page 100.
Read: 0 0 0
KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
Write:
Reset:00000000
$001C
Timebase Control Register
(TBCR)
See page 154.
Read: TBIF
TBR2 TBR1 TBR0
0
TBIE TBON R
Write:
TACK
Reset:00000000
$001D
IRQ Status and Control
Register (ISCR)
See page 94.
Read:0000IRQF10
IMASK1 MODE1
Write:RRRRRACK1
Reset:00000000
$001E
Configuration Register 2
(1)
(CONFIG2)
See page 48.
Read:
R
0
EXT-
XTALEN
EXT-
SLOW
EXT-
CLKEN
0
OSCENIN-
STOP
SCIBDSRC
Write:
Reset:00000000
$001F
Configuration Register 1
(1)
(CONFIG1) See page 47.
Read:
COPRS LVISTOP LVIRSTD LVIPWRD LVI5OR3 SSREC STOP COPD
Write:
POR Reset:
Other Resets:
0
0
0
0
0
0
0
0
0
U
0
0
0
0
0
0
1. LVI5OR3 is only writable after a power-on reset (POR). Bit 6 of CONFIG1 is read-only and will read 0.
All other bits in CONFIG1 and CONFIG2 are one-time writable after any reset.
$0020
Timer Status and Control
Register (TSC)
See page 163.
Read: TOF
TOIE TSTOP
00
PS2 PS1 PS0
Write: 0 TRST
Reset:00100000
$0021
Timer Counter Register High
(TCNTH)
See page 164.
Read: Bit 15 14 13 12 11 10 9 Bit 8
Write:
Reset:00000000
Addr.Register Name Bit 7654321Bit 0
= Unimplemented R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 2 of 5)