參數(shù)資料
型號: P89LPC922
廠商: NXP Semiconductors N.V.
英文描述: MINIATURE POWER RELAY
中文描述: 8位微控制器兩個(gè)小時(shí)80C51的核心2鍵盤/ 4 KB的/ 8 KB的3伏的低功耗Flash 256 - RAM的字節(jié)數(shù)據(jù)
文件頁數(shù): 13/45頁
文件大?。?/td> 877K
代理商: P89LPC922
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Special function registers
…continued
* indicates SFRs that are bit addressable.
Name
Description
SFR
addr.
MSB
P
P
8
9
P
R
1
[1]
[2]
[3]
All ports are in input only (high impedance) state after power-up.
BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is ‘0’. If any are written while BRGEN = 1, the result is unpredictable.
The RSTSRC register reflects the cause of the P89LPC920/921/922 reset. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on reset
value is xx110000.
After reset, the value is 111001x1, i.e., PRE2-PRE0 are all ‘1’, WDRUN = 1 and WDCLK = 1. WDTOF bit is ‘1’ after watchdog reset and is ‘0’ after power-on reset. Other resets will
not affect WDTOF.
On power-on reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.
The only reset source that affects these SFRs is power-on reset.
[4]
[5]
[6]
TRIM
WDCON
WDL
WFEED1
WFEED2
Internal oscillator trim register
Watchdog control register
Watchdog load
Watchdog feed 1
Watchdog feed 2
96H
A7H
C1H
C2H
C3H
-
ENCLK
PRE1
TRIM.5
PRE0
TRIM.4
-
TRIM.3
-
TRIM.2
WDRUN
TRIM.1
WDTOF
TRIM.0
WDCLK
[5] [6]
PRE2
[4] [6]
FF
11111111
Table 4:
Bit functions and addresses
Reset value
Hex
LSB
Binary
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