HD404618 Datasheet, PDF (27/91 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404618 Series
System Clock (ø_CPU)
Operating
Stopped
Non-time-base peripheral function clock (ø_PER) Operating Active mode
Standby mode
Subactive mode
Stopped —
Watch mode (TMA3 = 1)
Stop mode (TMA3 = 0)
Table 16 Operations in Low-Power Dissipation Modes
Function
Stop Mode
Watch Mode*³
Standby Mode
Subactive Mode*^{2, 3}
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
Serial interface Reset
Stopped*⁴
OP
OP
LCD
Reset
OP
OP
OP
DTMF
Reset
Reset
Stopped
Reset
I/O
Reset*¹
Retained
Retained
OP
Notes: OP indicates operating.
1. Output pins are at high impedance.
2. Subactive mode is an optional function specified on the function option list.
3. In the watch and subactive modes, the MCU requires a 32.768 kHz crystal oscillator.
4. Transmission/reception is activated if a clock is input in external clock mode. (However,
interrupts stop.)
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