Fujitsu MB89950/950A User Manual
128
CHAPTER 7 8-BIT PWM TIMER
7.3.1
PWM Control Register (CNTR)
The PWM control register (CNTR) is used to select the operating mode of the 8-bit PWM
timer (interval timer operation or PWM timer operation), enable or disable operation,
select the count clock, control interrupts, and check the state of the 8-bit PWM timer.
timer (interval timer operation or PWM timer operation), enable or disable operation,
select the count clock, control interrupts, and check the state of the 8-bit PWM timer.
■ PWM control register (CNTR)
Figure 7.3-3 PWM control register (CNTR)
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Initial value
0012
H
P/T
P1
P0
TPE
TIR
OE
TIE
0-000000
B
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TIE
Int errup t request enable bi t
0
Disables interrupt request output.
1
Enables interrupt request output.
OE
Output pin contro l bit
0
Functions as a general-purpose port (P41).
1
Functions as the interval timer/PWM timer output pin (PWM).
TIR
Interru pt request fl ag bi t
Read
Wri te
Interval ti mer fu ncti on
PWM timer
function
0
Counter value and set value do not match.
No change
Clears this bit.
1
Counter value and set value match.
No effect. The bit does not change.
TPE
Counter operation enable bit
Operating mode selection bit
Clock selection bits
0
Stops count operation.
1
Starts count operation.
P1
P0
0
0
Internal
count
clock
1 t
inst
(*
1
)
0
1
16 t
inst
1
0
64 t
inst
1
1
PWC timer output
P/T
0
Operates as an interval timer.
1
Operates as a PWM timer.
*1 : t
inst
: Instruction cycle
*2 : The "PWC timer output" referred to here is the
PWC timer output cycle
R/W : Readable and writable
: Unused
: Initial value
: Initial value
(*
1
)
(*
1
)
(*
2
)