参数资料
型号: UPD62AMC-XXX-5A4-A
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, PLASTIC, SSOP-20
文件页数: 15/62页
文件大小: 272K
代理商: UPD62AMC-XXX-5A4-A
22
PD62A
Data Sheet U14474EJ2V0DS00
5. STANDBY FUNCTION
5.1 Outline of Standby Function
To save current consumption, two types of standby modes, HALT mode and STOP mode, are made available.
In STOP mode, the system clock stops oscillation. At this time, the XIN and XOUT pins are fixed at a low level.
In HALT mode, CPU operation halts, while the system clock continues oscillating. When in HALT mode, the
timer (including REM output and LED output) operates.
In either STOP mode or HALT mode, the statuses of the data memory, accumulator, and port register, etc.
immediately before the standby mode was 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.
Table 5-1. Statuses During Standby Mode
STOP Mode
HALT Mode
Setting instruction
HALT instruction
Clock oscillation circuit
Oscillation stopped
Oscillation continues
CPU
Operation halted
Data memory
Immediately preceding status retained
Operation
Accumulator
Immediately preceding status retained
statuses
Flag
F
0 (When 1, the flag is not placed in the standby mode.)
CY
Immediately preceding status retained
Port register
Immediately preceding status retained
Timer
Operation halted
Operable
(The count value is reset to “0”)
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
system is not placed in the standby mode. However, the status flag (F) is set (1).
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