HD404459 Datasheet, PDF (30/122 Pages) Renesas Technology Corp – 4-bit HMCS400-series microcomputers

HD404459 Series
Table 20 Operations in Low-Power Dissipation Modes
Function
Stop Mode
Watch Mode
Standby Mode
Subactive Mode*²
CPU
Reset
Retained
Retained
OP
RAM
Retained
Retained
Retained
OP
Timer A
Reset
OP
OP
OP
Timer B
Reset
Stopped
OP
OP
Timer C
Reset
Stopped
OP
OP
Timer D
Reset
Stopped
OP
OP
SCI
Reset
Stopped*³
OP
OP
Comparator
Reset
Stopped
OP
Stopped
I/O
Reset*¹
Retained
Retained
OP
Note:
OP implies in operation
1. Output pins are at high impedance.
2. Subactive mode is an optional function to be specified on the function option list.
3. Transmission/reception is activated if a clock is input in external clock mode. However, all
interrupts stop.
Table 21 I/O Status in Low-Power Dissipation Modes
D₀–D₉
D₁₀–D ₁₁
R0–R8
R9₀, R9₁, R9₂
R9₃, RA
Output
Standby Mode,
Watch Mode
Retained
—
Retained or output of
peripheral functions
—
Stop Mode
High impedance
—
High impedance
—
Input
Active Mode,
Subactive Mode
Input enabled
Input enabled
Input enabled
Input enabled
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