Rev. 1.0, 02/00, page 256 of 1141
Bit 5
Enabling Interrupt of the Timer B (TMBIE): This bit works to permit/prohibit
occurrence of interrupt of timer B when the TCB overflows and when the TMBIF is set to 1.
Bit 5
TMBIE
Description
0
Prohibits interrupt of timer B
(Initial value)
1
Permits interrupt of timer B
Bits 4 and 3
Reserved: These bits cannot be modified and are always read as 1.
Bits 2 to 0
Clock Selection (TMB12 to TMB10): These bits work to select the clock to input to
the TCB. Selection of the rising edge or the falling edge is workable with the external event
inputs.
Bit 2
Bit 1
Bit 0
TMB12
TMB11
TMB10
Descriptions
0
0
0
Internal clock: Counts at
φ
/16384
(Initial value)
0
0
1
Internal clock: Counts at
φ
/4096
0
1
0
Internal clock: Counts at
φ
/1024
0
1
1
Internal clock: Counts at
φ
/512
1
0
0
Internal clock: Counts at
φ
/128
1
0
1
Internal clock: Counts at
φ
/32
1
1
0
Internal clock: Counts at
φ
/8
1
1
1
Counts at the rising edge and the falling edge of external
event inputs (TMBI) *
Note:
*
The edge selection for the external event inputs is made by setting the PMRA6 of the
port mode register A (PMRA). See section 12.2.4, Port Mode Register A (PMRA).