Data Registers - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

19.3.2 Data Registers

(1) Boundary Scan Register (JTAGBSR)

The Boundary Scan Register is a 471-bit register used to perform boundary-scan test. Bits in this

Connected between the JTDI and JTDO pins, this register is selected when issuing EXTEST or

SAMPLE/PRELOAD instruction. In "Capture-DR" state, this register captures the status of input

pins or internal logic output values. In "Shift-DR" state, while outputting the sampled value, it is

used to set pin functions (input/output pin and tristate output pin direction) and output values by

entering data for boundary-scan test.

(2) Bypass Register (JTAGBPR)

The Bypass Register is a 1-bit register used to bypass boundary-scan passes when the 32170 is

not the target of boundary-scan test. Connected between the JTDI and JTDO pins, this register is

selected when issuing BYPASS instruction. This register when in "Capture-DR" state has b'0

(fixed value) loaded into it.

(3) ID Code Register (JTAGIDR)

The ID Code Register is a 32-bit register used to identify the device and manufacturer. It holds

the following information:

• Version information (4 bits)

• Part number (16 bits)

• Manufacturer ID (11 bits)

This register is connected between the JTDI and JTDO pins, and is selected when issuing

IDCODE instruction. When in "Capture-DR" state, this register has the said IDCODE data loaded

into it, which is output from the JTDO pin in "Shift_DR" state.

This register is a read-only register, so that the data written from the JTDI pin during DR pass

sequence is ignored. Therefore, make sure JTDI input = low during "Shift-DR" state.

Note : For details about "Capture-DR" and "Shift-DR" states, refer to Section 19.4.

: b'0011 0010 0010 0000

: b'000 0001 1100

19.3 JTAG Registers

Manufacturer ID