HD404639R Datasheet, PDF (28/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

HD404639R Series
Table 18 Operations in Low-Power Dissipation Modes
Function
Stop Mode
Watch Mode
Standby Mode
Subactive Mode
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 interface 1, 2 Reset
Stopped*²
OP
OP
DTMF
Reset
Reset
OP
Reset
Comparator
Reset
Stopped
Stopped
OP
I/O
Reset*¹
Retained
Retained
OP
Notes: OP implies in operation
1. Output pins are at high impedance.
2. Transmission/reception is activated if a clock is input in external clock mode. However, all
interrupts stop.
Table 19 I/O Status in Low-Power Dissipation Modes
D₀–D ₁₁
D₁₂–D ₁₃ ,
RD₀–RD₃,
RE₀
R0₀–RC₁
Output
Standby mode, watch
mode
Retained
—
Stop mode
High impedance
—
Retained or output of
peripheral functions
High impedance
Input
Active mode, subactive
mode
Input enabled
Input enabled
Input enabled
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