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| 型號(hào)： | P89V51RD2 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8位80C51的5 V低功耗64 kB閃存1 KB RAM內(nèi)存控制器 |
| 文件頁(yè)數(shù)： | 57/77頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | P89V51RD2 |
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Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
57 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Table 46:
Bit addressable; Reset value: 00H
Bit
7
Symbol
EA
IEN0 - Interrupt enable register 0 (address A8H) bit allocation
6
5
4
3
2
1
0
EC
ET2
ES
ET1
EX1
ET0
EX0
Table 47:
Bit
7
IEN0 - Interrupt enable register 0 (address A8H) bit description
Symbol
Description
EA
Interrupt Enable Bit: EA = 1 interrupt(s) can be serviced, EA = 0
interrupt servicing disabled.
EC
PCA Interrupt Enable bit.
ET2
Timer 2 Interrupt Enable.
ES
Serial Port Interrupt Enable
ET1
Timer 1 Overflow Interrupt Enable.
EX1
External Interrupt 1 Enable.
ET0
Timer 0 Overflow Interrupt Enable.
EX0
External Interrupt 0 Enable.
6
5
4
3
2
1
0
Table 48:
Bit addressable; Reset value: 00H
Bit
7
Symbol
-
IEN1 - Interrupt enable register 1 (address E8H) bit allocation
6
-
5
-
4
-
3
2
-
1
-
0
-
EBO
Table 49:
Bit
7 to 4
3
2 to 0
IEN1 - Interrupt enable register 1 (address E8H) bit description
Symbol
Description
-
Reserved for future use. Should be set to ‘0’ by user programs.
EBO
Brown-out Interrupt Enable. 1 = enable, 0 = disable.
-
Reserved for future use. Should be set to ‘0’ by user programs.
Table 50:
Bit addressable; Reset value: 00H
Bit
7
Symbol
-
IP0 - Interrupt priority 0 low register (address B8H) bit allocation
6
5
4
3
2
1
0
PPC
PT2
PS
PT1
PX1
PT0
PX0
Table 51:
Bit
7
6
5
4
3
2
1
0
IP0 - Interrupt priority 0 low register (address B8H) bit description
Symbol
Description
-
Reserved for future use. Should be set to ‘0’ by user programs.
PPC
PCA Interrupt Priority Low Bit.
PT2
Timer 2 Interrupt Priority Low Bit.
PS
Serial Port Interrupt Priority Low Bit.
PT1
Timer 1 Interrupt Priority Low Bit.
PX1
External Interrupt 1 Priority Low Bit.
PT0
Timer 0 Interrupt Priority Low Bit.
PX0
External Interrupt 0 Priority Low Bit.
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