HD404356 Datasheet, PDF (24/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
Operating Modes
The MCU has three operating modes as shown in table 17. The operations in each mode are listed in tables
18 and 19. Transitions between operating modes are shown in figure 11.
Table 17 Operating Modes and Clock Status
Mode Name
Active
Standby
Activation method
RESET cancellation,
SBY instruction
interrupt request, STOPC
cancellation in stop mode
Status
System OP
OP
oscillator
Cancellation
method
RESET input, STOP/ SBY RESET input, interrupt
instruction
request
Note: OP implies in operation
Stop
STOP instruction
Stopped
RESET input, STOPC
input in stop mode
Table 18 Operations in Low-Power Dissipation Modes
Function
CPU
RAM
Timer A
Timer B
Timer C
Serial
A/D
I/O
Note: OP implies in operation
Stop Mode
Reset
Retained
Reset
Reset
Reset
Reset
Reset
Reset
Standby Mode
Retained
Retained
OP
OP
OP
OP
OP
Retained
Table 19 I/O Status in Low-Power Dissipation Modes
RA₁
R₀–D₈, R0–R4,
R8,
Output
Standby Mode
—
Retained or output of
peripheral functions
Stop Mode
—
High impedance
Input
Active Mode
Input enabled
Input enabled
24