參數(shù)資料
型號： UPD17231
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位單片機的小型通用紅外遙控器
文件頁數(shù)： 55/92頁
文件大?。?/td> 378K
代理商： UPD17231
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
55
8.
STANDBY FUNCTIONS
μ
PD17236 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 8-2 and Figure 8-1.
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, IRQBTM, or IRQ), whose interrupt enable flag (IPTM,
IPBTM, or IP) is set, occurs
<2> When any of P0A
0
-P0A
3
pins goes low
<3> When P0B
0
-P0B
3
, P0C
0
-P0C
3
, and P0D
0
-P0D
3
are used as input pins and any of these goes low
1000B (08H)
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
, P0C
0
-P0C
3
, P0D
0
-P0D
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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