HD404374 Datasheet, PDF (72/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
Timer mode register A (TMA: $00F)
Bit
Read/Write
Initial value on reset
Bit name
3
2
1
0
W
W
W
W
0
0
0
0
TMA3*⁴ TMA2 TMA1 TMA0
TMA3*⁴ TMA2 TMA1 TMA0 Source prescaler Input clock period Operating mode
0
0
1
0
0
1
1
0
0
0
1
1
0
1
1
0
0
1
0
0
1
1
1
0
0
1
1
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSW
PSW
PSW
PSW
PSW
2,048 tcyc
1,024 tcyc
512 tcyc
128 tcyc
32 tcyc
8 tcyc
4 tcyc
2 tcyc
32 twcyc
16 twcyc
8 twcyc
2 twcyc
1/2 twcyc
Not Used
Timer A
mode
Time base
mode
x : Don't care
1
x
PSW, TCA reset
Notes :
1. twcyc = 244.14 µs (using 32.768 kHz crystal oscillator)
2. Timer/counter overflow output period (s) = input clock period (s) × 256.
3. The division ratio must not be changed while time base mode is being used, as this
will result in an error in the overflow period.
4. Applies to HD404374 Series. In HD404384, HD404389, HD404082 and HD404084
Series, write as 0.
Figure 33 Timer Mode Register A (TMA)
Rev.5.00, Sep.11.2003, page 72 of 161