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General Description
The EM78P5840N/41N/42N series are 8-bit RISC architecture microcontroller devices designed and developed with low-power, high-speed CMOS technology. Each of these devices has on-chip 4K x 13-bit Electrical One Time Programmable Read Only Memory OTP-ROM). It provides a protection bit to prevent intrusion of user's OTP memory code as well as from unwanted external accesses. A number of one-time programmable option bits are also available to meet user's application requirements.
Functional flexibility of these integrated ICs is enhanced with their internal special features such as watchdog timer (WDT), program OTP-ROM, RAM, programmable real-time clock/counter, internal interrupt, power down mode, dual PWM (Pulse Width Modulation), 8-channel 10-bit A/D converter, and tri-state I/O.
NOTE
Refer to the Application Notes provided in the Appendix for important reminders before using the microcontroller described herein.
Convention on tables used to describe register attributes (bit number, bit name, type, etc.), are also provided in the Appendix. |
Features
CPU
- Operating voltage: 2.2V ~ 5.5V at the main CLK (less than 3.58MHz)
* Main CLK fSYS < 3.58MHz: 2.2V
* Main CLK fSYS = 14.3MHz: 3.6V
- IRC mode: 4MHz, 2MHz
* Voltage deviation: ±5% (2.3V ~ 5.5V)
* Process deviation: Typ. ±3%, Max. ±5%
* Temperature deviation: ±5% (-40°C ~ 85°C)
- 4K x 13 OTP-ROM
- 144 x 8 general propose RAM
- 19 bi-directional and three input-only general purpose I/O
- 8-level stack for subroutine nesting
- 8-bit real time clock/counter (TCC)
- One 8-bit counter interrupt
- On-chip watchdog timer (WDT)
- Single-instruction cycle commands
- Three operation modes using crystal oscillator (Main clock can be programmed to 3.58 MHz or 14.3 MHz):
| Mode |
CPU Status |
Main Clock |
32.768KHz Clock Status |
| Sleep |
Off |
Off |
Off |
| Green |
On |
Off |
On |
| Normal |
On |
On |
On |
- Two Normal mode frequency levels: 3.58 MHz and 14.3 MHz
- Input port interrupt function
- Dual-clock operation (Internal PLL main clock, External 32.768kHz)
Operating Frequency Mode
- Crystal mode (the XIN and XOUT pins are connected to the external crystal and capacitor)
- ERIC mode (the ERCI pin connects the resistor to VDD)
- IRC mode
PWM
- Dual PWM (Pulse Width Modulation) with 10-bit resolution
- Programmable period (or baud rate)
- Programmable duty cycle
ADC
- Operating voltage: 2.5V ~ 5.5V
Converter Rate |
74.6K |
37.4K |
18.7K |
9.3K |
Operating Voltage (min) |
3.5V |
3.0V |
2.5V |
2.5V |
- 8-channel 10-bit successive approximation A/D converter
- Internal (VDD) reference voltage
POR
Package Types
- EM78P5840NM: 18-pin SOP
- EM78P5840NP: 18-pin PDIP
- EM78P5841NM: 20-pin SOP
- EM78P5841NP: 20-pin PDIP
- EM78P5842NP: 24-pin PDIP
- EM78P5842NK: 24-pin Skinny DIP
Applications
- General purpose I/O product applications
- A/D applications
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