MOS INTEGRATED CIRCUIT
µPD784224, 784225, 784224Y, 784225Y
16/8-BIT SINGLE-CHIP MICROCONTROLLERS
The µPD784224 and 784225 are products of the µPD784225 Subseries in the 78K/IV Series. Besides a high-
speed and high performance CPU, these controllers have ROM, RAM, I/O ports, 8-bit resolution A/D and D/A
converters, timers, serial interfaces, a real-time output port, interrupt functions, and various other peripheral
The µPD784224Y and 784225Y are based on the µPD784225 Subseries with the addition of a multimaster-
supporting I2C bus interface.
Flash memory versions, the µPD78F4225 and 78F4225Y, which replace the internal ROM of the mask ROM
version with flash memory, and various development tools are also available.
The functions are explained in detail in the following user’s manuals. Be sure to read this manual when
designing your system.
µPD784225, 784225Y Subseries User’s Manual - Hardware : U12697E
78K/IV Series User’s Manual - Instruction
• I2C bus
• ROM correction
• Inherits peripheral functions of µPD780058Y
• Minimum instruction execution time
160 ns (main system clock fXX = 12.5 MHz)
61 µs (subsystem clock fXT = 32.768 kHz)
• I/O port: 67 pins
• Timer/counter: 16-bit timer/counter × 1 unit
8-bit timer/counter × 4 units
• Serial interface: 3 channels
UART/IOE (3-wire serial I/O): 2 channels
CSI (3-wire serial I/O, multi-master supporting I2C
busNote): 1 channel
Note µPD784225Y Subseries only
• Standby function
In power-saving mode: HALT/IDLE mode (with
• Clock division function
• Watch timer: 1 channel
• Watchdog timer: 1 channel
• Clock output function
fXX, fXX/2, fXX/22, fXX/23, fXX/24, fXX/25, fXX/26, fXX/27, fXT
• Buzzer output function
fXX/210, fXX/211, fXX/212, fXX/213 selectable
• A/D converter: 8-bit resolution × 8 channels
• D/A converter: 8-bit resolution × 2 channels
• Supply voltage: VDD = 1.8 to 5.5 V
Car audio, portable audio, telephones, etc.
Unless contextually excluded, references in this document to µPD784225 mean µPD784224, 784225, 784224Y,
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Document No. U12376EJ1V0DS00 (1st edition)
Date Published May 2000 J CP(K)
Printed in Japan
The mark shows major revised points.