參數(shù)資料
型號(hào)： μPD789176Y
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(jī)微控制器（8位單片微控制器）
文件頁數(shù)： 99/145頁
文件大?。?/td> 610K
代理商： ΜPD789176Y
Preliminary Product Information
98
μ
PD789166Y, 789167Y, 789176Y, 789177Y
(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 manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears IF0 and IF1 to 00H.
Figure 6-2. Format of Interrupt Request Flag Register
ADIF0
SMBOVIF0
SMBIF0TMIF90TMIF82TMIF81TMIF80
WTIIF
IF1
FFE1H
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.
6
7
5
4
3
2
1
0
WTIF
STIF20SRIF20
PIF3
PIF2
PIF1
PIF0 TMIF4
IF0
Symbol
Address
When reset
R/W
FFE0H
00H
R/W
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 3 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 3
in output mode, therefore, the interrupt mask flag must be set to 1 in advance.
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