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| 型號： | mPD789871 |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit Single-Chip Microcontrollers |
| 中文描述： | 8位單芯片微控制器 |
| 文件頁數(shù)： | 271/321頁 |
| 文件大小： | 1378K |
| 代理商： | MPD789871 |
CHAPTER 14 INTERRUPT FUNCTIONS
User’s Manual U15075EJ1V0UM00
271
(6)
Key return mode register 00 (KRM00)
This register sets the pin that detects a key return signal (falling edge of port 0).
KRM00 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets KRM00 to 00H.
Figure 14-7. Format of Key Return Mode Register 00
0
1
0
0
0
0
0
0
0
KRM000
KRM00
FFF5H
00H
R/W
Address
After reset
R/W
Key return signal detection control
No detection
Detection (detecting falling edge of port 0)
6
5
4
3
2
1
7
0
KRM000
Symbol
Cautions 1. Bits 1 to 7 must be set to 0.
2. Before setting KRM00, always set bit 6 of MK1 (KRMK00 = 1) to disable interrupts. After
setting KRM00, clear KRMK00 after clearing bit 6 of IF1 (KRIF00 = 0) to enable interrupts.
3. When P00 to P03 are in input mode, on-chip pull-up resistors are connected to P00 to P03 by
the setting of KRM000. After switching to output mode, the on-chip pull-up resistors are cut
off. However, key return signal detection continues.
Figure 14-8. Block Diagram of Falling Edge Detector
P00/KR0
P01/KR1
P02/KR2
P03/KR3
Falling edge detector
KRMK00
KRIF00 set signal
Standby release
signal
Key return mode register 00 (KRM00)
Note
S
Note
Selector that selects the pin used for falling edge input
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