HD404629R Datasheet, PDF (69/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R Series
The upper digit (TRBU) must be read first. At this time, the count of the timer B upper digit is
obtained, and the count of the timer B lower digit is latched to the lower digit (TRBL). After this, by
reading TRBL, the count of timer B when TRBU is read can be obtained.
Timer read register B (lower digit) (TRBL: $00A)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRBL3 TRBL2 TRBL1 TRBL0
Figure 51 Timer Read Register B Lower Digit (TRBL)
Timer read register B (upper digit) (TRBU: $00B)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRBU3 TRBU2 TRBU1 TRBU0
Figure 52 Timer Read Register B Upper Digit (TRBU)
• Port mode register C (PMRC: $025): Write-only register that selects R1₃/EVNB pin function as shown
in figure 53. It is reset to $0 by MCU reset.
Port mode register C (PMRC: $025)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
0
0
0
0
W
W
W
W
PMRC3 PMRC2 PMRC1 PMRC0
PMRC3
0
1
D₁₁/INT₀ mode selection
D₁₁
INT₀
PMRC1
0
1
R2₀/EVND mode selection
R2₀
EVND
PMRC2
0
1
D₁₀/STOPC mode selection
D₁₀
STOPC
PMRC0
0
1
R1₃/EVNB mode selection
R1₃
EVNB
Figure 53 Port Mode Register C (PMRC)
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