UPD17240 datasheet(4/102 Pages) NEC

Part #	UPD17240

Description	4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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Data Sheet U15002EJ1V0DS

µPD17240, 17241, 17242, 17243, 17244, 17245, 17246

DIFFERENCES BETWEEN

µPD17246 SUBSERIES, µPD17236 SUBSERIES, AND µPD17255

SUBSERIES (2/2)

Item

µPD17246 Subseries

µPD17236 Subseries

µPD17225 Subseries

STOP mode release

<1> When any of pins P0A0

When any of pins P0A0 to

condition

to P0A3 goes low

P0A3 and P0B0 to P0B3 goes

<2> When pins P0B0 to P0B3,

<2> When pins P0B0 to P0B3, low

P0C0 to P0C3, and P0D0

to P0D3 are used as input

to P0D3 are used as

pins and when any of

input pins and when any

them goes low

of them goes low

<3> When an interrupt

request (IRQ) of the

interrupt for which the IP

flag is set is generated at

flag is set is generated

the rising edge or falling

at the rising edge or

edge of the INT pin

falling edge of the INT

<4> When P0E0 to P0E3 are

used as input pins when

a key matrix is used and

when any of these pins

goes low

<5> When P1A0 to P1A2 and

P1B0 are used as input

pins when a key matrix is

used and when the level

of any of these pins

equals the set clear level

Carrier frequency

Selected by register file

Selected by mask option

7.8 kHz to 1 MHz

(fX = 4 MHz)

(after reset: fX/2)

<1> If carrier generation

<1> If carrier generation clock

clock is fX/2: 7.8 kHz to

is fX/2: 3.9 kHz to 1 MHz

1 MHz

<2> If carrier generation clock

<2> If carrier generation

is fX: 7.8 kHz to 2 MHz

clock is fX: 15.6 kHz to

<3> If carrier generation clock

2 MHz

is 2fX: 15.6 kHz to 4 MHz

NRZ low-level period

• NRZLTMM: 8 bits

• NRZLTMM: 7 bits (bit 7 is REM output control bit)

setting modulo register

(REM output control bit is bit

• NRZHTMM: 7 bits (bit 7 is fixed to 0)

(NRZLTMM) and NRZ

1 of register file at address

high-level period setting

12H)

modulo register

• NRZHTMM: 8 bits

(NRZHTMM)

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