HD404849 Datasheet, PDF(108/125 Page) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

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HD404849 Datasheet, PDF (108/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

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HD404849 Series

Programming and verification modes are selected as listed in table 32, the memory map in PROM mode is

shown in figure 90.

Table 32 PROM Mode Selection

Pin

Mode

CE

OE

VPP

Programming

Low

High

VPP

Verification

High

Low

VPP

Programming inhibited

High

High

VPP

O0âO4

Data input

Data output

High impedance

$0000

$0001

.

..

$001F

$0020

.

..

$007F

$0080

.

..

$1FFF

$2000

1 1 1 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Lower 5 bits

1

1

1 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Upper 5 bits $0000

Vector address

$000F

$0010

Zero-page subroutine

(64 words)

Pattern

(4,096 words)

$003F

$0040

$0FFF

$1000

Program

(16,384 words)

$7FFF

Upper three bits are not to be used

(fill them with 111)

Figure 90 Memory Map in PROM Mode

$3FFF

108

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