MB89821 datasheet(2/43 Pages) FUJITSU

2 / 43 page

MB89820 Series

(Continued)

• Three types of timers

8-bit PWM timer (also usable as a reload timer)

8-bit pulse width count timer (also usable as a reload timer)

20-bit time-base timer

• Two serial interfaces

8-bit synchronous serial interface (Switchable transfer direction allows communication with various equipment.)

UART (5-, 7-, 8-bit transfer capable)

• External interrupt: 2 channels

Capable of wake-up from low-power consumption modes (with an edge detection function)

• Low-power consumption modes

Stop mode (Oscillation stops to minimize the current consumption.)

Sleep mode (The CPU stops to reduce the current consumption to approx. 1/3 of normal.)

s PRODUCT LINEUP

(Continued)

MB89823

MB89P825

MB89PV820

Classification

Mass production product

(mask ROM products)

One-time PROM

product

Piggyback/evaluation

product for evaluation and

development

ROM size

4 K

× 8 bits

(internal mask ROM)

8 K

× 8 bits

(internal mask ROM)

16 K

× 8 bits

(internal PROM,

programming with

general-purpose

EPROM programmer)

32 K

× 8 bits

(external ROM)

RAM size

128

× 8 bits

256

× 8 bits

1024

× 8 bits

CPU functions

Number of instructions:

136

Instruction bit length:

8 bits

Instruction length:

1 to 3 bytes

Data bit length:

1, 8, 16 bits

Minimum execution time:

0.8

µs/5 MHz (VCC = 5.0 V)

Interrupt processing time:

7.2

µs/5 MHz (VCC = 5.0 V)

Ports

I/O ports (N-ch open-drain):

16 (All also serve as segment pins.)*1

I/O ports (N-ch open-drain):

I/O ports (CMOS):

6 (5 ports also serve as peripheral I/O.)

Input ports:

4 (1 port also serves as an external

interrupt input.)

Total:

32 (max.)

8-bit PWM timer

8-bit reload timer operation (toggled output capable)

8-bit resolution PWM operation

Operating clock (pulse width count timer output: 0.8

µs, 12.8 µs, 51.2 µs/5 MHz)

8-bit pulse width

count timer

8-bit reload timer operation

8-bit pulse width count operation (continuous measurement capable “H” width, “L” width, or

single-cycle measurement capable)

Operating clock (0.8

µs, 3.2 µs, 25.6 µs/5 MHz)

8-bit serial I/O

8 bits

One clock selectable from four transfer clocks

(one external shift clock, three internal shift clock, three internal shift clocks: 1.6

µs, 6.4 µs, 25.6 µs/5 MHz)

LSB first/MSB first selectability

MB89821

Part number

Parameter

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