HD6417750RF240DV Datasheet, PDF (933/1132 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)
21.1.3 Pin Configuration
Table 21.1 shows the H-UDI pin configuration.
Table 21.1 H-UDI Pins
Pin Name Abbreviation I/O
Function
When Not
Used
Clock pin TCK
Input
Same as the JTAG serial clock input pin. Data Open^*1
is transferred from data input pin TDI to the H-
UDI circuit, and data is read from data output
pin TDO, in synchronization with this signal.
Mode pin TMS
Input
The mode select input pin. Changing this
Open^*1
signal in synchronization with TCK determines
the meaning of the data input from TDI. The
protocol conforms to the JTAG (IEEE Std
1149.1) specification.
Reset pin TRST
Input
The input pin that resets the H-UDI. This signal ^{*2 *3}
is received asynchronously with respect to
TCK, and effects a reset of the JTAG interface
circuit when low. TRST must be driven low for
a certain period when powering on, regardless
of whether or not JTAG is used. This differs
from the IEEE specification.
Data input TDI
pin
Input
The data input pin. Data is sent to the H-UDI
circuit by changing this signal in
synchronization with TCK.
Open^*1
Data output TDO
pin
Output The data output pin. Data is sent to the H-UDI Open
circuit by reading this signal in synchronization
with TCK.
Emulator pin ASEBRK/
BRKACK
Input/ Dedicated emulator pin
output
Open^*1
Notes: 1. Pulled up inside the chip. When designing a board that allows use of an emulator, or
when using interrupts and resets via the H-UDI, there is no problem in connecting a
pullup resistance externally.
2. When designing a board that enables the use of an emulator, or when using interrupts
and resets via the H-UDI, drive TRST low for a period overlapping RESET at power-on,
and also provide for control by TRST alone.
3. Fixed to the ground or connected to the same signal line as RESET, or to a signal line
that behaves in the same way. However, there is a problem when this pin is fixed to the
ground. TRST is pulled up in the chip so, when this pin is fixed to the ground via
external connection, a minute current will flow. The size of this current is determined by
the rating of the pull-up resistor. Although this current has no effect on the chip's
operation, unnecessary current will be dissipated.
R01UH0456EJ0702 Rev. 7.02
Sep 24, 2013
Page 881 of 1076