Datasheet

Input/Output (I/O) Section
MC68HC908GR16A Data Sheet, Rev. 1.0
Freescale Semiconductor 31
$0018
ESCI Data Register
(SCDR)
See page 164.
Read: R7 R6 R5 R4 R3 R2 R1 R0
Write: T7 T6 T5 T4 T3 T2 T1 T0
Reset: Unaffected by reset
$0019
ESCI Baud Rate Register
(SCBR)
See page 165.
Read:
LINT LINR SCP1 SCP0 R SCR2 SCR1 SCR0
Write:
Reset:00000000
$001A
Keyboard Status
and Control Register
(INTKBSCR)
See page 103.
Read: 0000KEYF 0
IMASKK MODEK
Write:
ACKK
Reset:00000000
$001B
Keyboard Interrupt Enable
Register (INTKBIER)
See page 104.
Read:
KBIE7 KBIE6 KBIE5 KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
Write:
Reset:00000000
$001C
Timebase Module Control
Register (TBCR)
See page 214.
Read: TBIF
TBR2 TBR1 TBR0
0
TBIE TBON R
Write:
TACK
Reset:00000000
$001D
IRQ Status and Control
Register (INTSCR)
See page 98.
Read: 0000IRQF0
IMASK MODE
Write:
ACK
Reset:00000000
$001E
Configuration Register 2
(CONFIG2)
(1)
See page 75.
Read: 0000
R
TBMCLK-
SEL
OSCENIN-
STOP
ESCIBD-
SRC
Write:
Reset:00000001
$001F
Configuration Register 1
(CONFIG1)
(1)
See page 76.
Read:
COPRS LVISTOP LVIRSTD LVIPWRD
LVI5OR3
(Note 1)
SSREC STOP COPD
Write:
Reset:00000000
1
. One-time writable register after each reset, except LVI5OR3 bit. LVI5OR3 bit is only reset via POR (power-on reset).
$0020
Timer 1 Status and Control
Register (T1SC)
See page 225.
Read: TOF
TOIE TSTOP
00
PS2 PS1 PS0
Write: 0 TRST
Reset:00100000
$0021
Timer 1 Counter
Register High (T1CNTH)
See page 226.
Read: Bit 15 14 13 12 11 10 9 Bit 8
Write:
Reset:00000000
$0022
Timer 1 Counter
Register Low (T1CNTL)
See page 226.
Read: Bit 7 654321Bit 0
Write:
Reset:00000000
$0023
Timer 1 Counter Modulo
Register High (T1MODH)
See page 227.
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
Reset:11111111
Addr.Register Name Bit 7654321Bit 0
= Unimplemented R = Reserved U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 3 of 7)