參數(shù)資料
型號(hào)： EM78P451SWM
廠商： ELAN Microelctronics Corp .
英文描述： 8-Bit Microcontroller with OTP ROM
中文描述： 8位微控制器的OTP ROM的
文件頁(yè)數(shù)： 42/54頁(yè)
文件大?。?/td> 421K
代理商： EM78P451SWM
EM78P451S
8-Bit Microcontroller with OTP ROM
38
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
Q
Q
CLK
D
P
R
C
L
Q
Q
CLK
D
P
R
C
L
/IRQn
R3F
RESET
IOCF
RFWR
IOCFRD
IOCFWR
RFRD
IRQn
IRQm
IOD
ENI/DISI
interrupt
Fig. 17 Interrupt Input Circuit
4.9 Oscillator
4.9.1 Oscillator Modes
The EM78P451S can operate in four different oscillator modes. There are high XTAL
(HXT) oscillator mode, low XTAL (LXT) oscillator mode, External RC oscillator mode
(ERC), and Internal C
External R oscillator modes. User can select one of them by
programming MS, RCT, HLF and HLP in the Code Option Register. Table 9 depicts
how these three modes are defined.
Table 10 Oscillator Modes by MS, IRC, RCT.
Mode
MS
1
1
0
0
RCT
X
X
1
0
HLF
1
0
X
X
HLP
X
0
X
X
High XTAL Oscillator
Low XTAL Oscillator
External RC Oscillator
External R and Internal C Oscillator
<Note> X: Don’t care
4.9.2 Crystal Oscillator/Ceramic Resonators (XTAL)
EM78P451S can be driven by an external clock signal through the OSCI pin as shown
in Fig 18 below. In the most applications, pin OSCI and pin OSCO is connected with a
crystal or ceramic resonator to generate oscillation. Fig 19 depicts such circuit. Table
10 provides the recommended values of C1 and C2. Since each resonator has its own
attribute, user should refer to its specification for appropriate values of C1 and C2. RS,
a serial resistor may be necessary for AT strip cut crystal or low frequency mode.
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