HD404639R Datasheet, PDF(111/135 Page) Renesas Technology Corp

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HD404639R Datasheet, PDF (111/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

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HD404639R Series

MCU Mode

PROM Mode

MCU Mode

PROM Mode

Pin No. Pin Name

I/O Pin Name

I/O Pin No. Pin Name

I/O Pin Name I/O

R60

I/O A1

I 66

R93

I/O O1

I/O

R61

I/O A2

I 67

RA0

I/O O0

I/O

R62

I/O A3

I 68

RA1

I/O VCC

R63

I/O A4

I 69

RA2

I/O

R70

I/O O0

I/O 70

RA3

I/O

R71

I/O O1

I/O 71

RB0

I/O

R72

I/O O2

I/O 72

RB1

I/O

R73

I/O O3

I/O 73

RB2

I/O

R80

I/O O4

I/O 74

RB3

I/O

R81

I/O O5

I/O 75

RC0

I/O

R82

I/O O6

I/O 76

SEL

R83

I/O O7

I/O 77

TONEC

R90

I/O O4

I/O 78

TONER

R91

I/O O3

I/O 79

VCC

R92

I/O O2

I/O 80

VT ref

VCC

Notes: 1. I/O: Input/output pin, I: Input pin, O: Output pin

2. Each of O0âO4 has two pins; before using, each pair must be connected together.

Programming the Built-In PROM

The MCUâs built-in PROM is programmed in PROM mode. PROM mode is set by pulling TEST, M0, and

M1 low, and RESET high as shown in figure 93. In PROM mode, the MCU does not operate, but it can be

programmed in the same way as any other commercial 27256-type EPROM using a standard PROM

programmer and an 80-to-28-pin socket adapter. Recommended PROM programmers and socket adapters

of the HD407A4639 are listed in table 30.

Since an HMCS400-series instruction is ten bits long, the HMCS400-series MCU has a built-in conversion

circuit to enable the use of a general-purpose PROM programmer. This circuit splits each instruction into

five lower bits and five upper bits that are read from or written to consecutive addresses. This means that

if, for example, 16 kwords of built-in PROM are to be programmed by a general-purpose PROM

programmer, a 32-kbyte address space ($0000â$7FFF) must be specified.

Warnings

1. Always specify addresses $0000 to $7FFF when programming with a PROM programmer. If address

$8000 or higher is accessed, the PROM may not be programmed or verified correctly. Set all data in

unused addresses to $FF.

Note that the plastic-package version cannot be erased or reprogrammed.

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