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Revision History Hardware Strap Clock Domains Electronic Characteristics Package Information Revision History Rev. Draft 0. ENE reserves the right to amend this document without notice at any time. Care should be taken if these pins are applied with external pull-up to 5V. Under such condition there is a small amount leakage current flowing through the 5V into the internal 3. For easy understanding, different colors are used in the following tables to represent various pin groups and IO buffers.
Pin Assignment Side A Alt. Output Alt. Clock for LPC interface. Serialized IRQ. The E51CS can be used to select secondary memory spaces for development environment support.
Pullup OpenDrain Sch. Trg Output 5V Tol. Output 5V Tol. Input to this pin can be used as the clock for the timer. Analog to Digital Conversion Input 1. Analog to Digital Conversion Input 2. Analog to Digital Conversion Input 3. Analog to Digital Conversion Input 4. Analog to Digital Conversion Input 5. Analog to Digital Conversion Input 6. Analog to Digital Conversion Input 7. Digital to Analog Conversion Output 1 with 8-bit resolution.
Digital to Analog Conversion Output 2 with 8-bit resolution. Digital to Analog Conversion Output 3 with 8-bit resolution. Digital to Analog Conversion Output 4 with 8-bit resolution. Digital to Analog Conversion Output 5 with 8-bit resolution. Digital to Analog Conversion Output 6 with 8-bit resolution. Digital to Analog Conversion Output 7 with 8-bit resolution. Test Mode. Do Not Use. This pin MUST be pulled down externally for normal application. Refer to chapter 3 Hardware Strap for details.
This pin should be either pulled down or pulled up externally for normal application. This pin should be pulled up externally for normal application. Refer to chapter 3 Hardware Strap for details Test Mode. ECRST is used as the global reset signal for resetting all the chip s internal modules. The input usually comes from a power-on reset circuit. Either a High or Low value will be stored internally to serve as control signals as described below.
The purpose is to provide a stable signal level on these pins when system is power-on, so that pre-determined signal levels either high or low can be expected on these pins. For example, when one of XIOCS [F:0] is connected to an external device with active-high chip select input pin, then it is recommended to disable the internal pull-up resistor and add pull-down resistor on board so that the external device will not accidentally be written upon powering up.
If not disabled, LPC address will be forwarded onto X-bus with default mapping scheme. While this kind of MCU-based with GPIOs chip solution provides greater flexibility for notebook designers to implement custom features in their systems, the underlying firmware effort often becomes much more heavier.
As the complexity of todays notebook design increases, so does the firmware development effort, code size, power consumption and time to market. A detailed analysis of the firmware code for a typical notebook application reveals that the majority of code are used to handle repeated actions and routine functions which can otherwise be taken over or accelerated by hardware logic.
The accompanying advantages of hardware implementation over firmware are: 1. Shorten the development cycle of a notebook model. Less firmware code maintenance effort Easy migration to other models. KB is an based MCU with abundant peripheral controllers.
It includes the following hardware implemented peripheral controllers: keyboard controller; handles standard keyboard commands in hard wires. Keyboard scancode are downloadable and keyboard hot-keys are supported by the embedded These features make fully customized keyboard features possible.
It is instruction sets compatible with the standard microprocessor while its internal architecture has been modified to be Von Newman rather than Harvard.
The code memory can be mapped to the flash memory location. The code size required for KB is application dependent. KB requires only a KB itself support two levels of power saving mode sleep mode and deep sleep mode, in order to achieve maximum power saving. The development tool of KB is also compatible. ENE in-house uses the Keil-C tool for firmware development.
Most of the codes are written in C language so that they are easily transferable to other projects. There are other in-house developed tools to streamline the debugging and code-download are also available upon request.
There are 4 clock domains. Reset Source 1. LRST pin input, or 2. ECRST pin input 1. ECRST pin input, or 2. Internal disable 1. Internal WDT timeout, or 3. Refer to the EC module section for an example of some of the pre-defined extended commands.
The Extended EC commands are most useful for system host to access peripheral devices or KB resources while eliminating the potential possibility that they are being accessed by the firmware simultaneously. Hot-Keys are supported by firmware. On-chip peripheral devices are accessible either by the or by the Host. The on-chip peripheral address map is listed below. Note: The original is Harvard architecture code and data are in separated memory spaces , while the embedded in KB is Von Neumann architecture, namely, it s code and data are in the same memory space.
The code memory space of the embedded can. Details of the remapping of memory space are described in the XBI section. The Keil C development tool also supports banking codes which allows code size larger than 64KB.
The XRAM will not respond to instruction-fetch cyles, thereby it cannot be used as the code mmory for When a GPIO pin is configured in output mode, there are three register bits associated with that pin to control its output behavior. They are 1. The Pull-up Enable registers are used to control the internal pull-up for input pins. Refer to the table below.
Select Reg. No internal pull-up resistor associated with ADC digital inputs. Reserved FCh. ADC digital loop back test enable. KB inherits the hardware logic of its predecessor-- KB, and integrates a hardwired standard controller. Sandard KB commands are directly processed by hardware, while extended commands can be processed by KB can be configured to generate interrupts to the host when OBF is set. Keyboard is not inhibited. Address of the previous write cycle.
POST of the system is finished. Input Buffer Full flag. Output Buffer Full flag.
KB3910 View Datasheet(PDF) - Unspecified
Contributions welcome! The embedded controller is a small microcontroller typically used in laptops for various purposes. These ECs are supported by coreboot. There are several versions, with flash and with mask ROMs.
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