HD64F3437TF16 Datasheet, PDF(392/752 Page) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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HD64F3437TF16 Datasheet, PDF (392/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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Section 18 ROM (Mask ROM Version/ZTAT Version)

18.1 Overview

The size of the on-chip ROM is 60 kbytes in the H8/3437, 48 kbytes in the H8/3436, and 32

kbytes in the H8/3434. The on-chip ROM is connected to the CPU via a 16-bit data bus. Both byte

data and word data are accessed in two states, enabling rapid data transfer.

The on-chip ROM is enabled or disabled depending on the inputs at the mode pins (MD1 and

MD0). See table 18.1.

Table 18.1 On-Chip ROM Usage in Each MCU Mode

Mode

Mode 1 (expanded mode)

Mode 2 (expanded mode)

Mode 3 (single-chip mode)

Mode Pins

MD1

0

MD0

1

1

0

1

1

On-Chip ROM

Disabled (external addresses)

Enabled

Enabled

The PROM versions (H8/3437 ZTAT and H8/3434 ZTAT) and flash-memory version (H8/3437

F-ZTAT and H8/3434 F-ZTAT ) can be set to writer mode and programmed with a general-

purpose PROM programmer. In the H8/3437, the accessible ROM addresses are H'0000 to

H'EF7F (61,312 bytes) in mode 2, and H'0000 to H'F77F (63,360 bytes) in mode 3. For details, see

section 3, MCU Operating Modes and Address Space.

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