UPD78C14L 查看數據表（PDF） - NEC => Renesas Technology

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UPD78C14L

8-BIT SINGLE-CHIP MICROCONTROLLER (WITH A/D CONVERTER)

NEC => Renesas Technology 

µPD78C14(A)

(Continued)

Pin

RD

(Read

Strobe)

ALE

(Address

Latch

Enable)

MODE0

MODE1

(Mode)

NMI

(Non-

Maskable

Interrupt)

INT1

(Interrupt

Request)

AN7-AN0

(Analog

Input)

VAREF

(Reference

Voltage)

AVDD

(Analog

VDD)

AVSS

(Analog

VSS)

X1, X2

(Crystal)

RESET

(Reset)

STOP

(Stop)

VDD

VSS

Input/Output

Output

Output

Input/Output

Input

Function

This is a strobe signal output to read data from external memory. This signal

becomes high level except during the data read machine cycle for external memory.

This signal becomes output high impedance when the RESET signal is low or in

the hardware STOP mode.

This is a strobe signal to externally latch the low-order address information

output to pins PD7-PD0 to access the external memory. This signal becomes

output high impedance when the RESET signal is low or in the hardware STOP

mode.

Set the MODE0 pin to 0 (low level) and MODE1 pin to 1 (high level)Note.

When both pins MODE0 and MODE1 are set to 1Note, these pins synchronize to

the ALE and a control signal is output.

This pin inputs the edge triggering (falling edge) nonmaskable interrupt.

Input

Input

Input

Input

Input

This pin inputs edge triggering (rising edge) maskable interrupt. This pin is also

shared with zero-cross detection pin for AC input.

These eight pins input analog signals for the A/D converter. Pins AN7-AN4 can

be used as edge detection (falling edge) input.

This pin inputs the reference voltage for the A/D converter and controls the

operation for the A/D converter.

Power supply pin for the A/D converter

Ground pin for the A/D converter

These are crystal connecting pins for the system clock oscillation. When a clock

is externally supplied, input it through pin X1. Input the clock to X1 and its reverse

phase to X2.

This pin inputs the active-low reset input signal.

This pin inputs control signal of the hardware STOP mode. When the low level

of this signal is input, the oscillator stops to operate.

Positive power supply pin

Ground pin

Note

Pull-up with the following external resistor:

4 (kΩ) ≤ R ≤ 0.4 tCYC (kΩ)

tCYC (unit: ns)

Example 4 (kΩ) ≤ R ≤ 26 (kΩ): tCYC = 66 (ns) at 15 MHz

4 (kΩ) ≤ R ≤ 33 (kΩ): tCYC = 83 (ns) at 12 MHz

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