參數(shù)資料
型號: μPD789407
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 84/128頁
文件大?。?/td> 607K
代理商: ΜPD789407
84
μ
PD789405, 789406, 789407
(1) Interrupt request flag registers (IF0 and IF1)
An interrupt request flag is set (1), when the corresponding interrupt request is issued, or when the related
instruction is executed. It is cleared (0), when the interrupt request is accepted, when a RESET signal is input,
or when a related instruction is executed.
IF0 and IF1 are set using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears IF0 and IF1 to 00H.
Figure 6-2. Interrupt Request Flag Register Format
WTIF
STIF
SRIF
PIF3
PIF2
PIF1
PIF0 TMIF4
IF0
Symbol
Address
When reset
R/W
FFE0H
00H
R/W
XXIFX
0
1
Interrupt request flag
No interrupt request signal has been issued.
An interrupt request signal has been issued; an interrupt request has been made.
CMPIF ADIF
KRIF TMIF5 TMIF2 TMIF1 TMIF0 WTIFI
IF1
FFE1H
00H
R/W
6
7
5
4
3
2
1
0
6
7
5
4
3
2
1
0
Cautions 1. The TMIF4 flag can be read- and write-accessed only when the watchdog timer is being
used as an interval timer. It must be cleared to 0 if the watchdog timer is used in
watchdog timer mode 1 or 2.
2.
When port 2 is being used as an output port, and its output level is changed, an
interrupt request flag is set, because this port is also used as an external interrupt input.
To use port 2 in output mode, therefore, the interrupt mask flag must be set to 1 in
advance
.
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