H8SSLASH2218 datasheet(500/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Section 13 Boundary Scan Function

Rev.6.00 Jun. 03, 2008 Page 452 of 698

REJ09B0074-0600

13.3

The boundary scan function has the following registers. These registers cannot be accessed by the

CPU.

• Instruction register (INSTR)

• IDCODE register (IDCODE)

• BYPASS register (BYPASS)

• Boundary scan register (BSCANR)

13.3.1

Instruction Register (INSTR)

INSTR is a 3-bit register. At initialization, this register is specified to IDCODE mode. When

TRST is pulled low, or when the TAP controller is in the Test-Logic-Reset state, INSTR is

initialized. INSTR can be written by the serial data input from the TDI. If more than three bits of

instruction is input from the TDI, INSTR stores the last three bits of serial data.

If a command reserved in INSTR is used, the correct operation cannot be guaranteed.

Bit

Bit Name

Initial Value R/W

Description

TI2

—

TI1

—

Test Instruction Bits

Instruction configuration is shown in table 13.2.

TI0

—

Table 13.2

Instruction Configuration

Bit 2

Bit1

Bit 0

TI2

TI1

TI0

Instruction

EXTEST

SAMPLE/PRELOAD

CLAMP

HIGHZ

Reserved

IDCODE (initial value)

Reserved

BYPASS

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