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| 型號： | M38239GF-XXXFP |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 30/76頁 |
| 文件大小： | 896K |
| 代理商： | M38239GF-XXXFP |
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Rev.2.02 Jun 19, 2007 page 30 of 73
REJ03B0146-0202
3823 Group
Timer X
Timer X is a 16-bit timer that can be selected in one of four modes
and can be controlled the timer X write and the real time port by
setting the timer X mode register.
(1) Timer Mode
The timer counts f(X
IN
)/16 (or f(SUB)/16 in low-speed mode).
f(SUB) is the source oscillation frequency in low-speed mode.
f(SUB) shows the oscillation frequency of X
CIN
or the on-chip os-
cillator. Internal clock
φ
is f(X
CIN
)/2 in the low-speed mode.
(2) Pulse Output Mode
Each time the timer underflows, a signal output from the CNTR
0
pin is inverted. Except for this, the operation in pulse output mode
is the same as in timer mode. When using a timer in this mode,
set the corresponding port P5
4
direction register to output mode.
(3) Event Counter Mode
The timer counts signals input through the CNTR
0
pin.
Except for this, the operation in event counter mode is the same
as in timer mode. When using a timer in this mode, set the corre-
sponding port P5
4
direction register to input mode.
(4) Pulse Width Measurement Mode
The count source is f(X
IN
)/16 (or f(SUB)/16 in low-speed mode). If
CNTR
0
active edge switch bit is “0”, the timer counts while the in-
put signal of CNTR
0
pin is at “H”. If it is “1”, the timer counts while
the input signal of CNTR
0
pin is at “L”. When using a timer in this
mode, set the corresponding port P5
4
direction register to input
mode.
●
Timer X write control
If the timer X write control bit is “0”, when the value is written in the
address of timer X, the value is loaded in the timer X and the latch
at the same time.
If the timer X write control bit is “1”, when the value is written in the
address of timer X, the value is loaded only in the latch. The value
in the latch is loaded in timer X after timer X underflows.
If the value is written in latch only, when writing in the timer latch at
the timer underflow, the value is set in the timer and the latch at
one time. Additionally, unexpected value may be set in the high-or-
der counter when the writing in high-order latch and the underflow
of timer X are performed at the same timing.
●
Real time port control
While the real time port function is valid, data for the real time port
are output from ports P5
2
and P5
3
each time the timer X
underflows. (However, after rewriting a data for real time port, if
the real time port control bit is changed from “0” to “1”, data are
output independent of the timer X operation.) If the data for the
real time port is changed while the real time port function is valid,
the changed data are output at the next underflow of timer X.
Before using this function, set the corresponding port direction
registers to output mode.
■
Note on CNTR
0
interrupt active edge
selection
CNTR
0
interrupt active edge depends on the CNTR
0
active edge
switch bit.
Fig. 23 Structure of timer X mode register
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