EM78P156N
OTP ROM
Specification Revision History
Version
Content
1.0 Initial
version
1.1
Change Power on reset content
07/01/2003
1.2
Add the Device Characteristic at section 6.3
07/29/2004
Application Note
AN-001 EM78P156N v.s. EM78P156E on the DC Characteristics
This specification is subject to change without prior notice. 2
07.29.2004 (V1.2)
EM78P156N
OTP ROM
1. GENERAL DESCRIPTION
EM78P156N is an 8-bit microprocessor designed and developed with low-power, high-speed CMOS
technology.. It is equipped with 1K*13-bits Electrical One Time Programmable Read Only Memory
(OTP-ROM). It provides three PROTECTION bits to prevent user's code in the OTP memory from being
intruded. 8 OPTION bits are also available to meet user's requirements.
With its OTP-ROM feature, the EM78P156N is able to offer a convenient way of developing and verifying
user's programs. Moreover, user can take advantage of EMC Writer to easily program his development
code.
This specification is subject to change without prior notice. 3
07.29.2004 (V1.2)
EM78P156N
OTP ROM
2. FEATURES
Operating voltage range : 2.5V~5.5V
Operating temperature range: -40
C~85
C
Operating frequency rang (base on 2 clocks ):
* Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.5V.
* ERC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.5V.
Low power consumption:
* Less then 2 mA at 5V/4MHz
* Typically 20
A at 3V/32KHz
* Typically 1
A during sleep mode
1K
13 bits on chip ROM
One security register to prevent intrusion of OTP memory codes
One configuration register to accommodate user's requirements
48
8 bits on chip registers (SRAM, general purpose register)
2 bi-directional I/O ports
5 level stacks for subroutine nesting
8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt
Two clocks per instruction cycle
Power down (SLEEP) mode
Three available interruptions
* TCC overflow interrupt
* Input-port status changed interrupt (wake up from sleep mode)
* External interrupt
Programmable free running watchdog timer
8 programmable pull-high pins
7 programmable pull-down pins
8 programmable open-drain pins
2 programmable R-option pins
Package types:
* 18 pin DIP 300mil
: EM78P156NP
* 18 pin SOP 300mil
: EM78P156NM
* 20 pin SSOP 209mil
: EM78P156NAS
This specification is subject to change without prior notice. 4
07.29.2004 (V1.2)
EM78P156N
OTP ROM
* 20 pin SSOP 209mil
: EM78P156NKM
99.9% single instruction cycle commands
The transient point of system frequency between HXT and LXT is around 400KHz
This specification is subject to change without prior notice. 5
07.29.2004 (V1.2)
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