em6521 EM Microelectronic, em6521 Datasheet - Page 2

• Manufacturer Part Number: em6521
• Description: Mfp Version Of Em6621 Ultra Low Power Microcontroller With 4x20 Lcd Driver
• Manufacturer: EM Microelectronic

EM6521 at a glance
• Power Supply
- Low voltage low power architecture
- 2.0 … 5.5 V battery voltage
- 11 µA in active
- 1.8 µA in standby mode (Xtal, LCD off, 25 °C)
- 0.1 µA in sleep
- 32 KHz Oscillator
• RAM
- 64 x 4 bit, direct addressable
- 64 x 4 bit, indexed addressable
• EEPROM
- 4096 x 16 bit, metal mask programmable
• CPU
- 4-bit RISC architecture
- 2 clock cycles per instruction
- 72 basic instructions
• Main Operating Modes and Resets
- Active mode
- Standby mode (CPU in halt)
- Sleep mode
- Watchdog reset (logic and oscillation watchdogs)
- Reset terminal and POR
- Reset with input combination on port A (register
• Liquid Crystal Display Driver (LCD)
- 20 Segments 3 or 4 times multiplexed
- Internal or external voltage multiplier
- Free Segment allocation architecture
- LCD switch off for power save
• 8-Bit Serial Interface
- 3 wire master/slave mode
- READY output during data transfer
- Maximum shift clock is equal to system clock
- Interrupt request to the CPU after 8 bits
- Supports different serial formats
- Can be configured as a parallel 4 bit I/O port
- Direct input read on the port terminals
- All outputs can be put tristate (default)
- Selectable pull resistors in input mode
- CMOS or Nch. open drain outputs
• Millisecond Counter
- 3 digits binary coded decimal counter (12 bits)
- PA[3] input pulse width and period measurement
- Internal 1000 Hz clock generation
- Hardware or software controlled start stop mode
- Interrupt request on either 1/10 Sec or 1Sec
Copyright © 2005, EM Microelectronic-Marin SA
selectable)
including internal voltage regulator
R
(CPU is running)
(no clock, reset state)
mode (Xtal, LCD on, 25 °C)
mode (25 °C)
• 4-Bit Input Port A
- Direct input read on the port terminals
- Debouncer function available on all inputs
- Interrupt request on positive or negative edge
- Pull resistor selectable by register
- Test variables (software) for conditional jumps
- PA[0] and PA[3] are inputs for the event counter
- PA[3] is Start/Stop input for the millisecond counter
- Reset with input combination
• 4-Bit Bi-directional Port B
- All different functions bit-wise selectable
- Direct input read on the port terminals
- Data output latches
- CMOS or Nch. open drain outputs
- Pull-down or pull-up selectable
- Selectable PWM, 32kHz, 1kHz and 1Hz output
• Prescaler
- 15 stage system clock divider down to 1Hz
- 3 Interrupt requests; 1Hz, 32Hz or 8Hz, Blink
- Prescaler reset (4kHz to 1Hz)
• Voltage Level Detector (SVLD)
- 8 different levels from 1.2 V to 4.0 V (ROM Version)
- Busy flag during measure
• 10-Bit Universal Counter
- 10, 8, 6 or 4 bit up/down counting
- Parallel load
- Event counting (PA[0] or PA[3])
- 8 different input clocks
- Full 10 bit or limited (8, 6, 4 bit) compare function
- 2 interrupt requests (on compare and on 0)
- Hi-frequency input on PA[3] and PA[0]
- Pulse width modulation (PWM) output
• Melody Generator
- Dedicated Buzzer terminal
- 7 tones plus silence output
- The output can be put tristate (default)
- Internal 4-bit timer, usable also in standalone mode
- 4 different timer input clocks
- Timer with automatic reload or single run
- Timer interrupt request when reaching 0
• Interrupt Controller
- 5 external and 8 internal interrupt request sources
- Each interrupt request can individually be masked
- Each interrupt flag can individually be reset
- Automatic reset of each interrupt request after read
- General interrupt request to CPU can be disabled
- Automatic enabling of general interrupt request flag
when going into HALT mode
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EM6521