參數(shù)資料
型號(hào): P87C557E8
廠(chǎng)商: NXP Semiconductors N.V.
元件分類(lèi): 8位微控制器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁(yè)數(shù): 49/84頁(yè)
文件大小: 322K
代理商: P87C557E8
1999 Mar 12
49
Philips Semiconductors
Product specification
8-bit microcontroller
P8xC557E8
Table 72
PLL Control Register (address F9H)
Table 73
Description of PLLCON bits
Table 74
System clock frequency (f
clk
) selection
Other combinations than mentioned in this table, are reserved and may not be selected. This allows to generate the
standard baudrates 19200, 9600, 4800, 2400 and 1200 Baud, when using the UART and Timer 1.
7
6
5
4
3
2
1
0
RUN32
ENSECI
SECINT
FSEL.4
FSEL.3
FSEL.2
FSEL.1
FSEL.0
BIT
SYMBOL
DESCRIPTION
7
RUN32
If RUN32 = 0, then the 32 kHz oscillator is halted during Power-down
mode. If RUN32 = 1, then the 32 kHz oscillator remains active during
Power-down mode.
Enable the seconds interrupt; enabling INT1 is also required.
Seconds interrupt requested by an overflow of the seconds timer (which
occurs every second) or via writing a logic 1 to this bit. SECINT can only
be cleared by writing a logic 0 to this bit.
System clock frequency selection bits; see Table 74.
6
5
ENSECI
SECINT
4 to 0
FSEL.4 to FSEL.0
FSEL.4
FSEL.3
FSEL.2
FSEL.1
FSEL.0
f
CLK
(MHz)
3.93
7.86
15.73
4.72
9.44
5.51
11.01
6.29
12.58
1
0
0
1
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
1
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
handbook, halfpage
MBH084
C1
HIGH
C2
C1 = C2 = 20 pF
quartz crystal
or ceramic
resonator
VSS
XTAL2
XTAL1
SELXTAL1
Fig.17 Using the on-chip oscillator.
handbook, halfpage
MBH085
HIGH
n.c.
external
clock
signal
VSS
XTAL2
XTAL1
SELXTAL1
Fig.18 Using an external clock.
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