HD404629R Datasheet, PDF (68/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R Series
Timer mode register B2 (TMB2: $013)
Bit
Initial value
Read/Write
Bit name
3
2
1
—
—
0
—
—
R/W
Not used Not used TMB21
0
0
R/W
TMB20
TMB21 TMB20
0
0
1
1
0
1
R1₀/TOB mode selection
R1₀
R1₀ port
TOB Toggle output
TOB 0 output
TOB 1 output
Figure 48 Timer Mode Register B2 (TMB2)
• Timer mode register B2 (TMB2: $013): Two-bit read/write register that selects the timer B output
mode as shown in figure 48. It is reset to $0 by MCU reset.
• Timer write register B (TWBL: $00A, TWBU: $00B): Write-only register consisting of the lower digit
(TWBL) and the upper digit (TWBU) as shown in figures 49 and 50. The lower digit is reset to $0 by
MCU reset, but the upper digit value is invalid.
Timer B is initialized by writing to timer write register B. In this case, the lower digit (TWBL) must be
written to first, but writing only to the lower digit does not change the timer B value. Timer B is
initialized to the value in timer write register B at the same time the upper digit (TWBU) is written to.
When timer write register B is written to again and if the lower digit value needs no change, writing
only to the upper digit initializes timer B.
Timer write register B (lower digit) (TWBL: $00A)
Bit
Initial value
Read/Write
Bit name
3
0
W
TWBL3
2
0
W
TWBL2
1
0
W
TWBL1
0
0
W
TWBL0
Figure 49 Timer Write Register B Lower Digit (TWBL)
Timer write register B (upper digit) (TWBU: $00B)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
W
W
W
W
TWBU3 TWBU2 TWBU1 TWBU0
Figure 50 Timer Write Register B Upper Digit (TWBU)
• Timer read register B (TRBL: $00A, TRBU: $00B): Read-only register consisting of the lower digit
(TRBL) and the upper digit (TRBU) that holds the count of the timer B upper digit (figures 51 and 52).
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