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PDF EM78611E Data sheet ( Hoja de datos )
| Número de pieza | EM78611E | |
| Descripción | Universal Serial Bus Series Microcontroller | |
| Fabricantes | ELAN Microelectronics | |
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EM78611E
Universal Serial Bus
Series Microcontroller
Product
Specification
DOC. VERSION 1.1
ELAN MICROELECTRONICS CORP.
November 2011
1 page  
EM78611E
Universal Serial Bus Series Microcontroller
1 General Description
The EM78611E is a series of 8-bit Universal Serial Bus RISC architecture
microcontroller. It is specifically designed for USB low speed device application and to
support standard devices such as PS/2 keyboard. The EM78611E also supports one
device address and three endpoints. With no firmware involved, these series of
microcontrollers can automatically identify and decode Standard USB Command to
Endpoint Zero.
The EM78611E has eight-level stacks and six interrupt sources. It has a maximum of
12 General Input/Output pins. Each device has 144 bytes of general purpose SRAM,
and 6K bytes of program ROM. These series of ICs have Dual Clock mode which
allows the device to run on very low power saving frequency.
2 Features
Operating voltage 4.4V ~ 5.5V
Low-cost solution for low-speed USB devices, such as keyboard, joystick, and
Gamepad.
USB Specification Compliance
• Universal Serial Bus Specification Version 1.1
• USB Device Class Definition for Human Interface Device (HID), Firmware
Specification Version 1.1
• Support 1 device address and 3 endpoints
USB Application
• P75 (D-) has an internal pull-high resistor (1.5KΩ)
• USB protocol handling
• USB device state handling
• Identifying and decoding of Standard USB commands to EndPoint Zero
PS/2 Application Support
• Built-in PS/2 port interface for keyboard and mouse
Built-in 8-bit RISC MCU
• 8-level stacks for subroutine and interrupt
• 6 available interrupts
• 8-bit real time clock/counter (TCC) with overflow interrupt
• Built-in RC oscillator free running for Watchdog Timer and Dual clock mode
• Two independent programmable prescalers for WDT and TCC
Product Specification (V1.1) 11.30.2011
(This specification is subject to change without further notice)
•1
5 Page 
EM78611E
Universal Serial Bus Series Microcontroller
6.2.2 Operation Registers
The following sections will introduce each of the Operation Registers of the Special
Purpose Registers. The Operation Registers are arranged according to the order of
registers’ address. Note that some registers are read only, while others are both
readable and writable.
6.2.2.1 R0 (Indirect Addressing Register) Default Value: (0B_0000_0000)
R0 is not a physically implemented register. Its major function is as an indirect
addressing pointer. Any instruction using R0 as a pointer actually accesses the data
pointed by the RAM Select Register (R4).
6.2.2.2 R1 (Timer / Clock Counter) Default Value: (0B_0000_0000)
This register TCC, is an 8-bit timer or counter. It is readable and writable as any other
register. The Timer module will increment every instruction cycle. User can work
around this by writing an adjusted value. The Timer interrupt is generated when the R1
register overflows from FFh to 00h. This overflow sets bit TCIF (RF[0]). The interrupt
can be masked by clearing bit TCIE (IOCF[0]). After a Power-on reset and Watchdog
reset, the initial value of this register is 0x00.
6.2.2.3 R2 (Program Counter & Stack) Default Value: (0B_0000_0000)
The EM78611E Program Counter is a 13-bit long register that allows accessing of the
6k words of Program Memory with 8-level stacks. The eight LSB bits, A0~A7, are
located at R2, while the three MSB bits, A12~A10, are located at R3. The Program
Counter is cleared after a Power-on reset or Watchdog reset. The first instruction that
is executed after a reset is located at Address 00h.
Product Specification (V1.1) 11.30.2011
(This specification is subject to change without further notice)
•7
11 Page | ||
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| PDF Descargar | [ Datasheet EM78611E.PDF ] | |
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