HD404449 Datasheet, PDF (28/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 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
Serial 1, 2
Reset
Stopped*³
OP
OP
A/D
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 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
D₀–D ₁₁
D₁₂–D ₁₃
R0–RC
I/O Status in Low-Power Dissipation Modes
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
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