EM78612
Universal Serial Bus Microcontroller
Product Specification (V1.0)03.2 2.2006 •
••
•35
(This specification is subject to change without further notice)
EM78612 has one CODE option registers, which are not part of the normal progra m memory.
The option bits cannot be accessed during normal program execution.
8 7 6 5 4 3 2 1 0
R.S. Package_
1
Package_
0
OST_1 OST_0 Frequenc
y
Bit 0 (Frequency) : Frequency Selection.
0: The MCU run on 12 MHz
1: The MCU run on 6 MHz
Bit 2~1 (OST_1 ~ OST_0) : Oscillator Start-up Time.
00: 500us
01: 2ms
10: 8ms
11: 16ms
Bit 4~3 (Package_1 ~ Package_0) : Package t ype selector.
00 : 16 pins
01 : 18 pins
10 : 20 pins
11 : No define
Bit 5 (R.S.) : Resistor Switch. enable of Transceiver.
0: Disconnect internal USB D- pull high Register
1: Connect internal USB D- pull high Resister
Bit 8~6 :The values are fixed.