upd6133 Renesas Electronics Corporation., upd6133 Datasheet - Page 22

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upd6133

Manufacturer Part Number
upd6133
Description
4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
Manufacturer
Renesas Electronics Corporation.
Datasheet

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5. STANDBY FUNCTION
5.1 Outline of Standby Function
timer (including REM output and LED output) operates.
immediately before the standby mode is set are retained. Therefore, make sure to set the port status for the system
so that the current consumption of the whole system is suppressed before the standby mode is set.
22
Setting instruction
Clock oscillator
Operation
statuses
To save current consumption, two types of standby modes, i.e., HALT mode and STOP mode, are made available.
In STOP mode, the system clock stops oscillation. At this time, the X
In HALT mode, CPU operation halts, while the system clock continues oscillation. When in HALT mode, the
In either STOP mode or HALT mode, the statuses of the data memory, accumulator, and port register, etc.
Cautions 1. Write the NOP instruction as the first instruction after STOP mode is canceled.
2. When standby mode is canceled, the status flag (F) is set (to 1).
3. If, at the point the standby mode has been set, its cancelation condition is met, then the
CPU
Data memory
Accumulator
Flag
Port register
Timer
system is not placed in the standby mode. However, the status flag (F) is set (1).
F
CY
Table 5-1. Statuses During Standby Mode
HALT instruction
Oscillation stopped
• Operation halted
• Immediately preceding status retained
• Immediately preceding status retained
• Immediately preceding status retained
• Operation halted
• Immediately preceding status retained
• 0 (When 1, the flag is not placed in the standby mode.)
(The count value is reset to “0”)
Data Sheet U10454EJ6V0DS00
STOP Mode
IN
and X
Oscillation continued
• Operable
OUT
pins are fixed at a low level.
HALT Mode
PD6133, 6134

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