UPD17145 datasheet(27/102 Pages) NEC

Part #	UPD17145

Description	SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS

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Manufacturer	NEC [NEC]

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µPD17145(A1), 17147(A1), 17149(A1)

9.2 Function of Data Buffer

The data buffer has two main functions.

One is to transfer data with the peripheral hardware, and the other is to read the constant data on the program

memory (table reference). Figure 9-3 shows the relationships between the data buffer and peripheral hardware.

Figure 9-3. Data Buffer and Peripheral Hardware

01H

02H

03H

04H

40H

45H

Shift register (SIOSFR)

Timer 0 modulo register (TM0M)

Timer 1 modulo register (TM1M)

A/D converter data

register (ADCR)

Address register (AR)

Timer 0 timer 1 count

register (TM0TM1C)

Data buffer

(DBF)

Internal bus

Program memory

(ROM)

Constant data

Peripheral address

Peripheral hardware

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