HD6417750RF240DV Datasheet, PDF (945/1132 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7750 Series

SH7750, SH7750S, SH7750R Group
Section 21 High-performance User Debug Interface (H-UDI)
except by the following operations: update in the Update-IR state, initialization in the Test-Logic-
Reset state, and initialization by assertion of TRST.
21.3.4 Boundary Scan (EXTEST, SAMPLE/PRELOAD, BYPASS) (SH7750R Only)
In the SH7750R, setting a command from the H-UDI in SDIR can place the H-UDI pins in the
boundary scan mode. However, the following limitations apply.
1. Boundary scan does not cover clock-related signals (EXTAL, EXTAL2, XTAL, XTAL2, and
CKIO).
2. Boundary scan does not cover reset-related signals (RESET, CA)
3. Boundary scan does not cover H-UDI-related signals (TCK, TDI, TDO, TMS, TRST).
4. With EXTEST, assert the MRESET pin (low), the RESET pin (low), and CA pin (high). With
SAMPLE/PRELOAD, assert the CA pin (high).
5. To perform boundary scan, supply a clock to the EXTAL pin, and wait for the power-on
oscillation settling time to elapse before starting boundary scan. The frequency range of the
input clock is from 1 to 33.3 MHz.
Note that after the power-on oscillation settling time has elapsed, a clock does not need to be
supplied to the EXTAL pin any longer.
For details on the power-on oscillation settling time, see section 22, Electrical Characteristics.
21.4 Usage Notes
1. SDIR Command
Once an SDIR command has been set, it remains unchanged until initialization by asserting
TRST or placing the TAP in the Test-Logic-Reset state, or until another command (other than
an H-UDI interrupt command) is written from the H-UDI.
2. SDIR Commands in Sleep Mode
Sleep mode is cleared by an H-UDI interrupt or H-UDI reset, and these exception requests are
accepted in this mode. In standby mode, neither an H-UDI interrupt nor an H-UDI reset is
accepted.
3. In standby mode, the H-UDI function cannot be used. Furthermore, TCK must be retained at a
high level when entering the standby mode in order to retain the TAP state before and after
standby mode.
4. The H-UDI is used for emulator connection. Therefore, H-UDI functions cannot be used when
an emulator is used.
5. The H-UDI pins of the SH7750 and SH7750S must not be connected to a boundary-scan signal
loop on the board.
R01UH0456EJ0702 Rev. 7.02
Sep 24, 2013
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