DATA SHEET
MOS Integrated Circuit
μ PD65881GB-P02
μPD71051-Compliant Serial Control Unit Gate Array
Following the phase-out of it popular μ PD71051 standard serial control unit (USART), NEC Electronics is now
offering the μ PD65881GB-P02 serial control unit, a functional and low-cost substitute for the μ PD71051.
To verify the applicability of the μ PD65881GB-P02 gate array as a replacement for the μ PD71051, you must first
test an equivalent prototype in the system being developed. If the in-system test is deemed successful, then you may
proceed to purchase mass production versions of the product.
DESCRIPTION
Internal block functions and commands are the same as those of the μ PD71051. Differences between the two
products are listed below. Before adopting this product, carefully read the disclaimer below and the caution in section
3 (CAUTIONS WHEN CONSIDERING ADOPTION OF THIS PRODUCT).
The μ PD65881GB-P02 integrates an NA55A IP macro in a CMOS-N5 gate array that can be used as a peripheral
I/O device to transmit serial data synchronously, asynchronously, or bi-synchronously.
The USART receives serial data streams and converts them into parallel data characters for the CPU. While
receiving serial data, the USART can also accept parallel data from the CPU, convert it to serial data, and then
transmit it. The USART signals the CPU when it has received or transmitted a character and requires service. The
CPU may read complete USART status data at any time.
FEATURES
• Synchronous operation
• One or two synchronous characters
• Internal/external synchronization
• Automatic SYNC character insertion
• Asynchronous operation
• Clock rate (baud rate): ×1, ×16, or ×64
− Send stop bits: 1, 1.5, or 2 bits
− Break transmission
− Automatic break detection
− Valid start bit detection
• Baud rate: DC ~ 660 Kb/s at ×1 clock
• Full-duplex, double-buffered transmitter/receiver
• Error detection: parity, overrun, and framing
• Five- to eight-bit characters
• Low-power standby mode
• Compatible with standard microcontrollers
• Functionally equivalent to (except in standby mode) and can replace the μ PD8251AF
• CMOS process technology
• Single +5V ±10% power supply
• Industrial temperature range (Ambient): –40 to 85°C
• 44-pin QFP package
• RoHS-compliant
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all products and/or types are available in every country. Please check with an NEC Electronics
sales representative for availability and additional information.
Document No. A18499EJ2V0DS00 (2nd edition)
Date Published December 2007 NS
Printed in Japan
© NEC Electronics Corporation 2007
