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CHAPTER 14 16-BIT RELOAD TIMER
■ Operating State of 16-bit Timer Register
The operating state of the 16-bit timer register is determined by the timer operation enable bit in the timer
control status register (TMCSR:CNTE) and the WAIT signal. The operating states include the stop state,
start trigger input wait state (WAIT state), and RUN state.
Figure 14.5-3 shows the state transition diagram for the 16-bit timer registers.
Figure 14.5-3 State Transition Diagram
CNTE=0 CNTE=0
CNTE=1
TRG=0
TRG=1 TRG=1
UF=1&
RELD=1
CNTE=1
TRG=1
UF=1&
RELD=0
CNTE=0, WAIT=1
LOAD CNTE=1, WAIT=0
CNTE=1, WAIT=1 CNTE=1, WAIT=0
WAIT
TRG
CNTE
UF
RELD
STOP state
TIN pin: Input disable
TOUT pin: General-purpose I/O port
16-bit timer register:retain the value at stop
the value immediately after
resetting is undefined
Reset
WAIT state
RUN state
TIN pin: only trigger input is valid
16-bit timer register:retains the value at stop
the value immediately
after resetting is undefined
TOUT pin: outputs value of 16-bit
reload register
TIN pin:function as input pin of 16-bit
reload timer
TOUT pin:function as output pin of
16-bit reload timer
16-bit timer register: operation
Loads 16-bit reload register value to
16-bit timer register
(one-shot mode)
(reload mode)
(software trigger)
(software trigger)
Load ended
External trigger from TIN
: State transition by hardware
: State transition by register access
: WAIT signal (internal signal)
: Software trigger bit (TMCSR)
: Timer operation enable bit (TMCSR)
: Underflow generating flag bit (TMCSR)
: Reload select bit (TMCSR)