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HD404849FS Datasheet(PDF) 36 Page - Renesas Technology Corp

Part # HD404849FS
Description  4-Bit Single-Chip Microcomputer
PDF  127 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404849FS Datasheet(HTML) 36 Page - Renesas Technology Corp

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HD404849 Series
34
Active mode
Watch mode
Active mode
Oscillation
stabilization period
Interrupt strobe
INT
Interrupt request
generation
(During the transition
from watch mode to
active mode only)
0
TT
t RC
Tx
T:
t
:
RC
Interrupt frame length
Oscillation stabilization period
Figure 17 Interrupt Frame
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
0
0
W
MIS0
1
0
W
MIS1
Miscellaneous register (MIS: $00C)
MIS1
0
MIS0
T *
0
0.24414 ms
tRC
0.12207 ms
0.24414 ms
7.8125 ms
31.25 ms
Oscillation circuit conditions
External clock input
Ceramic oscillator
Crystal oscillator
0
1
1
1
0
1
15.625 ms
62.5 ms
Not used
—
Notes: 1.
2.
The values of T and tRC are applied when a 32.768-kHz crystal oscillator is used.
The value is applied only when direct transfer operation is used.
Buffer control.
Refer to figure 38.
MIS3
MIS2
1
* 1
* 2
Figure 18 Miscellaneous Register (MIS)
Subactive Mode: The OSC
1 and OSC2 oscillator stops and the MCU operates with a clock generated by
the X1 and X2 oscillator. In this mode, functions except the A/D conversion operate. However, because
the operating clock slows down, power dissipation is reduced, next least to watch mode.



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