Datasheet

I/O Section
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor 41
$0021
Keyboard Interrupt Enable
Register (KBIER)
Read:000
KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
Write:
$0022
Timer A Counter Register
High (TACNTH)
Read: Bit 15 14 13 12 11 10 9 Bit 8
Write:
$0023
Timer A Counter Register
Low (TACNTL)
Read:Bit 7654321Bit 0
Write:
$0024
Timer A Modulo Register
High (TAMODH)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
$0025
Timer A Modulo Register
Low (TAMODL)
Read:
Bit 7 6 5 4 3 2 1 Bit 0
Write:
$0026
Timer A Channel 0 Status
and Control Register (TASC0)
Read: CH0F
CH0IE MS0B MS0A ELS0B ELS0A TOV0 CH0MAX
Write: 0
$0027
Timer A Channel 0 Register
High (TACH0H)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
$0028
Timer A Channel 0 Register
Low (TACH0L)
Read:
Bit 7 6 5 4 3 2 1 Bit 0
Write:
$0029
Timer A Channel 1 Status
and Control Register (TASC1)
Read: CH1F
CH1IE
0
MS1A ELS1B ELS1A TOV1 CH1MAX
Write: 0 R
$002A
Timer A Channel 1 Register
High (TACH1H)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
$002B
Timer A Channel 1 Register
Low (TACH1L)
Read:
Bit 7 6 5 4 3 2 1 Bit 0
Write:
$002C
Timer A Channel 2 Status
and Control Register (TASC2)
Read: CH2F
CH2IE MS2B MS2A ELS2B ELS2A TOV2 CH2MAX
Write: 0
$002D
Timer A Channel 2 Register
High (TACH2H)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
$002E
Timer A Channel 2 Register
Low (TACH2L)
Read:
Bit 7 6 5 4 3 2 1 Bit 0
Write:
$002F
Timer A Channel 3 Status
and Control Register (TASC3)
Read: CH3F
CH3IE
0
MS3A ELS3B ELS3A TOV3 CH3MAX
Write: 0 R
$0030
Timer A Channel 3 Register
High (TACH3H)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
$0031
Timer A Channel 3 Register
Low (TACH3L)
Read:
Bit 7 6 5 4 3 2 1 Bit 0
Write:
Addr.Register Name Bit 7654321Bit 0
= Unimplemented R = Reserved
Figure 2-2. I/O Data, Status and Control Registers (Sheet 3 of 5)