PC87570  Product Folder

The PC87570 is a highly integrated embedded RISC-based controller optimized for power management (PM), keyboard and mouse (KBC) and system control in portable Personal Computer (PC) applications.

The PC87570 incorporates National's CompactRISC(TM) CR16A core, a high performance 16-bit RISC processor core, a Bus Interface Unit (BIU) that directly interfaces with memory and I/O devices, on-chip memory and system support functions. Among these are legacy functions, handled by the Host Bus Interface (HBI), that include the Real-Time Clock and Advanced Power Control (RTC and APC), and peripherals, including: frequency-multiplier-based High Frequency Clock Generator (HFCG), Power Mode Control (PMC), Interrupt Control Unit (ICU), Multi-Input Wake-Up (MIWU), General Purpose I/O Ports (GPIO) with internal keyboard matrix scanning, PS/2 Interface, ACCESS.bus (ACB) Interface, two Multi-Function 16-Bit Timers (MFT16), periodic interrupt timer and WATCHDOG(TM) (TWD), ADC and DAC.

The PC87570 highly efficient architecture and its on-chip peripherals, supporting functions and low power consumption, provide a highly integrated solution for portable notebook PCs, sub-notebook PCs and other portable devices.

Outstanding Features

• Shared BIOS memory
• Fully ACPI-compliant embedded controller
• Proprietary PS/2 shift mechanism
• Extremely low current consumption in Idle mode
• Support for a variety of off-chip wake-up sources
• Scalable design for growth without controller upgrade

• CR16A Core
• 16-bit embedded RISC processor core
• Bus Interface Unit (BIU)
• Three address zones for static devices (SRAM, ROM FLASH, I/O)
• Configurable wait states and fast read bus cycles
• Internal Memory
• 2048 bytes of on-chip ROM
• 1024 bytes of on-chip RAM
• All memories can hold both code and data
• External Memory
• Supports BIOS memory (Flash) sharing with PC host
• Up to 56 Kbyte for code and data
• Field upgradable with Flash or SRAM devices
• Supports host controlled code download and update
• Host Bus Interface (HBI)
• Three host interface channels, typically used for the KBC, PM and RTC devices
• Motherboard Plug and Play (PnP) configuration
• With Enable and Lock bits for each device
• Relocatable address for each device
• Host power supply indicator input pin
• 8042 KBC standard Interface (60h, 64h)
• Intel 80C51SL compatible
• IRQ1 and IRQ12 support
• Fast Gate A20 and Fast host Reset, via firmware
• PM interface port (62h, 66h)
• PM port IRQ11
• Real-Time Clock (RTC) and Advanced Power Control (APC)
• RTC
• DS1287, MC146818 and PC87911 compatible
• 242 bytes battery backed-up CMOS RAM
• Calendar including century and automatic leap-year adjustment
• Optional daylight saving adjustment
• BCD or binary format for timekeeping
• Three individually maskable interrupt event flags: periodic rates from 122 µs to 500 ms; time-of-day alarm, once per second to once per day
• Separate backup battery pin
• Double buffer time registers
• The CMOS RAM and the RTC registers can be accessed by the CR16A firmware
• APC
• Alarm wake-up
• Hardware wake-up events
• Software off events
• HFCG
• On-chip frequency multiplier
• Single 32.786KHz crystal
• Software controlled frequency generation
• PMC
• 3.3 and 5V operation with mixed voltage system support
• Reduced power consumption capability
• Back-drive protection
• Three power modes, switched by software or hardware:
• Active mode operating frequency 4-10MHz
• Idle (20 µA)
• Power Off - RTC only (0.9 µA typical) from backup battery
• Automatic wake-up on system events
• ICU
• 16 maskable interrupt sources
• Four general purpose external interrupt inputs
• Programmable trigger mode (level: high or low, edge: falling or rising)
• Enable and pending indication for each interrupt
• Non-maskable interrupt input
• MIWU
• Supports up to 24 wake-up or interrupt inputs
• Generates wake-up to PMC
• Generates interrupts to ICU
• Provides user-selectable trigger conditions
• GPIO
• 76 ports
• I/O pins individually configured as input or output
• Configurable internal pull-up resistors
• Special ports for internal keyboard matrix scanning
• 16 open-collector outputs
• 8 Schmidt inputs with internal pull-up
• Special input for system On/Off switch
• Supports very low-cost implementation of additional off-chip I/O ports
• PS/2 Interface
• Supports three independent devices (external KBC, mouse and additional pointing device)
• Supports byte level handling via hardware accelerator
• ACB Interface
• Intel SMBus and Philips I2C compatible
• ACCESS.bus master and slave
• Supports polling and interrupt controlled operation
• Generates a wake-up signal on detection of a Start Condition, while in power-down mode
• Optional internal pull-up on SDA and SCL pins
• MFT16
• Two 16-bit timers
• Each timer supports Pulse Width Modulator (PWM), Capture and Counter capabilities
• TWD
• 16-bit periodic interrupt timer with 30-µs resolution and 5-bit prescaler, for system tick and periodic wake-up tasks
• 8-bit WATCHDOG timer
• ADC
• Eight channels, 8-bit resolution
• 10 µs conversion/channel
• Internal or external voltage reference
• DAC
• Four channels, 8-bit resolution
• 1 µs conversion time for 50 pF load
• Full output range from AGND to AVCC
• Supports Microsoft Advanced Power Management (APM) specifications revision 1.2, February 1996
• Generates the System Management Interrupt (SMI)
• 160-pin PQFP and 176-pin TQFP packages

ACCESS.bus® is a registered trademark of Digital Equipment Corporation.

I2C® is a registered trademark of Philips Corporation.

PS/2 is a registered trademark of International Business Machines Corporation.

Microsoft® and Windows® are registered trademarks of Microsoft Corporation.

SMBus is a registered trademark of Intel Corporation.

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

WATCHDOG(TM) is a trademark of National Semiconductor Corporation.