EM78P156 Ver la hoja de datos (PDF) - Elan Microelectronics Corp
Número de pieza
componentes Descripción
Fabricante
EM78P156 Datasheet PDF : 28 Pages
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EM78P156E
Table 9 RC Oscillator Frequencies
Cext
Rext
20pF
100pF
300pF
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
Average Fosc @ 5V, 25°C
3.92 MHz
2.67 MHz
1.39 MHz
1.49 KHz
1.39 MHz
940 KHz
480 KHz
52 KHz
595 KHz
400 KHz
200 KHz
21 KHz
Average Fosc @ 3V, 25°C
3.65 MHz
2.60 MHz
1.40 MHz
156 KHz
1.33 MHz
920 KHz
475 KHz
50 KHz
560 KHz
390 KHz
200 KHz
20 KHz
* 1. Measured on DIP packages.
2. Design reference only
4. IRC Oscillator Mode
In IRC mode, it consists of an internal C which default frequency value is 4MHz. We suggest that the external Resistant
value here should be 50KΩ connected to vdd with internal C.
VI.8 CODE Option Register
1. Code Option Register
The EM78P156E has one Code option register which is not a part of the normal program memory. The option bits
can not be accessed during normal program execution.
12
11
10
MS
ENWDTB CLKS
9
8
7
6
5~0
PTB
HLF
IRCEN
HLP
------
Bit 12 (MS): Oscillator type selection.
0: RC type
1: XTAL type (XTAL1 and XTAL2)
Bit 11 (ENWDTB): Watchdog Timer enable.
0: Enable
1: Disable
Bit 10 (CLKS): Instruction period option.
0: two oscillator periods
1: four oscillator periods
Refer to the section of Instruction Set.
Bit 9 (PTB): Protect bit
0: Enable
1: Disable
Bit 8 (HLF): XTAL frequency selection.
0: XTAL2 type (Low frequency, 32.768KHz)
* This specification is subject to be changed without notice. 8.11.1999
B3-20
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