h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 221

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

8.2
The RFU has the following registers.
8.2.1
FSTR is a 32-bit readable/writable register used to access the FIFO status/register/pointer of the
pointer sets (0 to 3). Any one of four registers/pointers (BAR, RAR, WAR, and TMP) and four
states (DATAN, FREEN, NRA, and NWA) can be accessed using FSTR.
The status is updated by writing (selecting pointer or status) to DTRSR. The new status should be
referenced after writing to DTRSR, even when referencing the same pointer or same status.
BAR in pointer set 0 is selected via the initial value of DTRSR, however, an undefined value is
read from FSTR until data is written to DTRSR.
FIFO status/register/pointer (FSTR)
Base address register (BAR)
Read address pointer (RAR)
Write address pointer (WAR)
Temporary pointer (TMP)
Valid data byte number (DATAN)
Free area byte number (FREEN)
Read start address (NRA)
Write start address (NWA)
Data transfer control register A (DTCRA)
Data transfer control register B (DTCRB)
Data transfer status register C (DTSTRC)
Data transfer ID register (DTIDR)
Data transfer ID read/write select register A (DTIDSRA)
Data transfer ID read/write select register B (DTIDSRB)
Data transfer status register A (DTSTRA)
Data transfer status register B (DTSTRB)
Data transfer control register C (DTCRC)
Data transfer control register D (DTCRD)
Data transfer interrupt enable register (DTIER)
Data transfer select register (DTRSR)
FIFO Status/Register/Pointer (FSTR)
Register Descriptions
Rev. 3.00 Jan 25, 2006 page 169 of 872
Section 8 RAM-FIFO Unit (RFU)
REJ09B0286-0300