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參數(shù)資料
| 型號(hào)： | UPD17225CT |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 46/84頁(yè) |
| 文件大?。?/td> | 393K |
| 代理商： | UPD17225CT |
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μ
PD17225, 17226, 17227, 17228
46
Data Sheet U12643EJ2V0DS00
8.
STANDBY FUNCTIONS
μ
PD17225 is provided with HALT and STOP modes as standby functions. By using the standby function, current
consumption can be reduced.
In the HALT mode, the program is not executed, but the system clock f
X
is not stopped. This mode is main-
tained, until the HALT mode release condition is satisfied.
In the STOP mode, the system clock is stopped and program execution is stopped. This mode is maintained, until the
STOP mode release condition is satisfied.
The HALT mode is set, when the HALT instruction has been executed. The STOP mode is set, when the STOP
instruction has been executed.
8.1
HALT Mode
In this mode, program execution is temporarily stopped, with the main clock continuing oscillating, to reduce current
consumption. Use the HALT instruction to set the HALT mode.
The HALT mode releasing condition can be specified by the operand for the HALT instruction, as shown in Table
8-1.
After the HALT mode has been released, the operation is performed as shown in Table 8-1 and Figure 8-2.
Caution Do not execute an instruction that clears the interrupt request flag (IRQ
×××
) for which the interrupt
enable flag (IP
×××
) is set immediately before the HALT 8H instruction; otherwise, the HALT mode
may not be set.
Table 8-1. HALT Mode Releasing Conditions
Operand Value
Releasing Conditions
0010B (02H)
When interrupt request (IRQTM) occurs for 8-bit timer
<1>
When interrupt request (IRQTM, IRQWTM, or IRQ), whose interrupt enable flag (IPTM,
IPBTM, or IP) is set, occurs
When any of P0A
0
-P0A
3
and P0B
0
-P0B
3
pins goes low
1000B (08H)
<2>
Other Than Above
Setting prohibited
Table 8-2. Operations After HALT Mode Release (1/2)
(a)
HALT 08H
HALT Mode Released by:
Interrupt Status
Interrupt Enable Flag
Operations after HALT Mode Release
Low-Level Input of P0A
0
-P0A
3
,
P0B
0
-P0B
3
Don’t care
Don’t care
Instruction next to HALT is executed
When Release Condition Is
Satisfied by Interrupt
DI
Disabled
Standby mode is not released
Enabled
Instruction next to HALT is executed
EI
Disabled
Standby mode is not released
Enabled
Branches to interrupt vector address
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UPD17225CT-XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17225GT | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17225GT-XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|4-BIT|UPD17K CPU|CMOS|SOP|28PIN|PLASTIC |
| UPD17225MC | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17225MC-XXX-5A4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
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