HD404889_03 Datasheet, PDF (91/197 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Timer write register B (lower) (TWBL: $012)
Bit
Read/Write
Initial value on reset
Bit name
3
W
0
TWBL3
2
W
0
TWBL2
1
W
0
TWBL1
0
W
0
TWBL0
Figure 41 Timer Write Register B (Lower) (TWBL)
Timer write register B (upper) (TWBU: $013)
Bit
3
2
1
0
Read/Write
W
W
W
W
Initial value on reset Undetermined Undetermined Undetermined Undetermined
Bit name
TWBU3 TWBU2 TWBU1 TWBU0
Figure 42 Timer Write Register B (Upper) (TWBU)
• Timer read register B (TRBL: $012, TRBU: $013):
Timer read register B (TRBL, TRBU) is a read-only register composed of a lower digit (TRBL) and an
upper digit (TRBU) from which the value of the upper digit of timer B is read directly (figures 43 and
44).
First, read the upper digit (TRBU) of timer read register B. The current value of the timer B upper digit
is read and, at the same time, the value of the timer B lower digit is latched in the lower digit (TRBL) of
timer read register B. The timer B value is obtained when the upper digit (TRBU) of timer read register
B is read by reading the lower digit (TRBL) of timer read register B.
Timer read register B (lower) (TRBL: $012)
Bit
Read/Write
Initial value on reset
Bit name
3
2
1
0
R
R
R
R
Undetermined Undetermined Undetermined Undetermined
TRBL3 TRBL2 TRBL1 TRBL0
Figure 43 Timer Read Register B (Lower) (TRBL)
Rev.6.00, Sep.08.2003, page 91 of 197