SH7751 Datasheet, PDF (924/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

21. High-performance User Debug Interface (H-UDI)
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.
The maximum frequency of TCK (TMS, TDI, TDO) is 20 MHz. Make the TCK or this LSI CPG
setting so that the TCK frequency is lower than that of this LSI's peripheral module clock.
21.1.4 Register Configuration
Table 21.2 shows the H-UDI registers. Except for SDBPR and SDBSR, these registers are mapped
in the control register space and can be referenced by the CPU.
Table 21.2 H-UDI Registers
CPU Side
H-UDI Side
Name
Abbre-
P4
viation R/W Address
Area 7
Address
Access Initial
Access Initial
Size Value*¹ R/W Size Value*¹
Instruction
register
SDIR R
H'FFF00000 H'1FF00000 16
H'FFFF R/W 32
H'FFFFFFFD
(Fixed
value*²)
Data register SDDR/ R/W H'FFF00008 H'1FF00008 32/16 Unde- — —
—
H
SDDRH
fined
Data register SDDRL R/W H'FFF0000A H'1FF0000A 16
Unde- — —
—
L
fined
Bypass
SDBPR — —
—
—
Unde- R/W 1
—
register
fined
Interrupt
factor
register
SDINT R/W H'FFF00014 H'1FF00014 16
H'0000 W*³ 32
H'00000000
Boundary SDBSR — —
—
—
Unde- R/W —
Undefined
scan
fined
register
Notes: 1. Initialized when the TRST pin goes low or when the TAP is in the Test-Logic-Reset
state.
2. The value read from H-UDI is fixed (H'FFFFFFFD).
3. 1 can be written to the LSB using the H-UDI interrupt command.
Rev.4.00 Oct. 10, 2008 Page 826 of 1122
REJ09B0370-0400