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HD4046212RFS Datasheet(PDF) 63 Page - Renesas Technology Corp

Part # HD4046212RFS
Description  AS Microcomputer Incorporating a DTMF Generator Circuit
PDF  157 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD4046212RFS Datasheet(HTML) 63 Page - Renesas Technology Corp

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HD404629R Series
61
Bit
Initial value
Read/Write
Bit name
3
0
W
TMA3
2
0
W
TMA2
0
0
W
TMA0
1
0
W
TMA1
Timer mode register A (TMA: $008)
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSW
PSW
PSW
PSW
—
Operating mode
Timer A mode
TMA3
TMA1
TMA2
TMA0
Source
prescaler
2048tcyc
1024tcyc
512tcyc
128tcyc
32tcyc
8tcyc
4tcyc
2tcyc
Input clock
frequency
0
1
1
32tWcyc
16tWcyc
8tWcyc
2tWcyc
1/2tWcyc
Time-base
mode
0
0
1
1
0
1
1
—
—
X : Don’t care
Note: 1.
2.
3.
4.
tWcyc = 244.14 µs (when a 32.768-kHz crystal oscillator is used)
Timer counter overflow output period (seconds) = input clock period (seconds)
× 256.
If PSW of TCA reset is selected while the LCD is operating, LCD operation halts (power switch
goes off and all SEG and COM pins are grounded).
When an LCD is connected for display, the PSW and TCA reset periods must be set in the
program to the minimum.
The division ratio must not be modified during time-base mode operation, otherwise an overflow
cycle error will occur.
Not used
Reset PSW and TCA
Figure 44 Timer Mode Register A (TMA)
Timer B
Timer B Functions: Timer B has the following functions.
• Free-running/reload timer
• External event counter
• Timer output operation (toggle, 0, and 1 outputs)



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