Renesas M16C/6NK Informações Técnicas descarregar pdf (Página 146)

Rev.2.10 Apr 14, 2006 page 122 of 378

REJ09B0124-0210

M16C/6N Group (M16C/6NK, M16C/6NM) 13. Timers

Item Specification

Count source • Two-phase pulse signals input to TAiIN or TAiOUT pins

Count operation • Up-count or down-count can be selected by two-phase pulse signal

• When the timer overflows or underflows, it reloads the reload register

contents and continues counting. When operating in free-running mode,

the timer continues counting without reloading.

Divide ratio 1/ (FFFFh - n + 1) for up-count

1/ (n + 1) for down-count n : set value of the TAi register 0000h to FFFFh

Count start condition Set the TAiS bit in the TABSR register to 1 (count starts)

Count stop condition Set the TAiS bit to 0 (count stops)

Interrupt request generation timing

Timer overflow or underflow

TAiIN pin function Two-phase pulse input

TAiOUT pin function Two-phase pulse input

Read from timer Count value can be read by reading the TAi register

Write to timer • When not counting and until the 1st count source is input after counting start

Value written to TAi register is written to both reload register and counter

• When counting (after 1st count source input)

Value written to TAi register is written to reload register

(Transferred to counter when reloaded next)

Select function

(1)

• Normal processing operation (timers A2 and A3)

The timer counts up rising edges or counts down falling edges on TAjIN

pin when input signals on TAjOUT pin is “H”.

Table 13.3

Event Counter Mode Specifications (when using two-phase pulse signal processing with timers A2, A3, and A4)

• Counter initialization by Z-phase input (timer A3)

The timer count value is initialized to 0 by Z-phase input.

Up-

count

Up-

count

Up-

count

Down-

count

Down-

count

Down-

count

TAjOUT

TAjIN

Count up all edges

Count down all edges

TAkOUT

TAkIN

• Multiply-by-4 processing operation (timers A3 and A4)

If the phase relationship is such that TAkIN pin goes “H” when the input

signal on TAkOUT pin is “H”, the timer counts up rising and falling edges

on pins TAkOUT and TAkIN. If the phase relationship is such that TAkIN

pin goes “L” when the input signal on TAkOUT pin is “H”, the timer counts

down rising and falling edges on pins TAkOUT and TAkIN.

i = 2 to 4

j = 2, 3

k = 3, 4

NOTE:

1. Only timer A3 is selectable. Timer A2 is fixed to normal processing operation, and timer A4 is fixed to

multiply-by-4 processing operation.

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 411 412

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