em78p811 ELAN Microelectronics Corp, em78p811 Datasheet - Page 7

• Manufacturer Part Number: em78p811
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

VII.Functional Descriptions
VII.0 OTP ROM
_________________________________________________________________________________________________________________________________________________________________
* This specification is subject to be changed without notice.
1. OTP ROM
2. Operation Mode
3. Mode selection
Mode is selected by voltage switch on VPP pin. The timing is as follow.
* The OTP ROM’s size is 16k x13 bits which can be serially writen and read.
1. Regular mode: This mode is provided to program and verify OTP memory only.
2. OTP row mode: This mode is designed to provide capability programming and verifying of ROM data for the
3. Option mode(Option register) :
4. Bit line stress mode : This mode is provides to test the reliability of ROM cells. Bit line mode is to apply the
5. Word line stress mode : This mode is provides to test the reliability of ROM cells. Word line mode is to apply the
6. Test mode : This mode is provided for verifying the speed of data from OTP memory.
The mode provides user a special mode for selecting option.
Bit0 :MCLK : main clock
Bit1 :/PT :Protect bit
Bit2..Bit12: code for user ID
plastic OTP packages. One external row is added in addition to the regular ROM array. The user’s data can be
sequentially written into the ROM memory in OTP row by advancing the consecutive address to avoid the circuit
change of program counter in microcontroller.
programmed drain voltage on all bit lines but all word lines are ground.
programming gate voltage on all word lines but all bit lines are ground.
1.Regular mode
2.OTP row mode
3.Option mode
4.Bit line stress
5.Word line stress
6.Test mode
Bit12..Bit2 ….
Code
mode
VPP(RESET)
0: 1.84MHz
1: 3.68MHz
0:enable
1:disable
….
I
0
1
0
1
0
1
DATAIN(p73)
Bit1
/PT
Programming voltage input. Vpp can be varied from 10.5V to 12.5V
Bit0
MCLK
0
0
1
1
0
0
OEB(p74)
6
0
0
0
0
1
1
PGMB(p75)
8-bit OTP Micro-controller
EM78P811