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CHAPTER 14 16-BIT RELOAD TIMER
Table 14.3-2 Functions of Timer Control Status Registers (High) (TMCSR: H)
Bit name Function
bit15
to
bit12
Undefined bits Read: The value is undefined.
Write: No effect
bit11
bit10
CSL1, CSL0:
Count clock select bits
These bits select the count clock of the 16-bit reload timer.
When set to anything other than "11
B
": These bit is counted by internal
clock (internal clock mode).
When set to "11
B
": The edge of the external event clock is counted (event
count mode).
bit9
to
bit7
MOD2, MOD1, MOD0:
Operating mode select
bits
These bits set the operation conditions of the 16-bit reload timer.
[Internal clock mode]
The MOD2 bit is used to select the function of the input pin.
When MOD2 bit set to 0:
The input pin functions as a trigger input.
The MOD1 and MOD0 bits are used to select the edge to be detected.
When the edge is detected, the value set in the 16-bit reload register
(TMRLR) is reloaded in the 16-bit timer register (TMR), starting the count
operation of the TMR.
When MOD2 set to 1:
The input pin functions as a gate input.
The MOD1 bit is not used. The MOD0 bit is used to select the signal level
(High or Low) to be detected. The count operation of the 16-bit timer
register (TMR) is performed only when the signal level is inputted.
[Event count mode]
The MOD2 bit is not used. An external event clock is inputted from the input
pin. The MOD1 and MOD0 bits are used to select the edge to be detected.