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HD4043312 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name
Description
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HD4043312
Hitachi
Hitachi -> Renesas Electronics Hitachi
HD4043312 Datasheet PDF : 78 Pages
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HD404339 Series
The MCU automatically provides an oscillation stabilization period tRC when operation switches from
watch mode to active mode. The interrupt frame period T and one of three values for tRC can be selected
with the miscellaneous register (MIS: $00C), as listed in figure 14.
Operation can switch directly from subactive mode to active mode, as illustrated in figure 15. In this case,
the transition time TD obeys the following relationship.
tRC < TD < T + tRC
Miscellaneous register (MIS: $00C)
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
1
0
W
MIS1
0
0
W
MIS0
MIS3 MIS2
Buffer control.
Refer to figure 24.
MIS1
0
0
1
1
MIS0
0
1
0
1
T*1
tRC*1
Oscillation Circuit Conditions
0.24414 ms 0.12207 ms External clock input
0.24414 ms*2
15.625 ms 7.8125 ms Ceramic oscillator
125 ms
62.5 ms
Crystal oscillator
Not used
Notes: 1. The values of T and tRC are applied when a 32.768-kHz crystal oscillator is used.
2. The value is applied only when direct transfer operation is used.
Figure 14 Miscellaneous Register
22
 

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