h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 234

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

Section 8 RAM-FIFO Unit (RFU)
Rev. 3.00 Jan 25, 2006 page 182 of 872
REJ09B0286-0300
Bit
7
6
5
4
3
2
1
0
Bit Name
CHS2
CHS1
CHS0
RS
POS1
POS0
STS1
STS0
Initial Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Pointer Number Select
These bits represent the pointer set number to
be accessed from FSTR, DTCRA, DTCRB,
DTIDR, and DTSTRC.
Register Select
Selects whether to access register/pointer or
FIFO status by FSTR.
0: FSTR accesses register/pointer
1: FSTR accesses FIFO status
Register/Pointer Select 1, 0
These bits select the register/pointer to be
accessed by FSTR while the RS bit is 0.
00: The base address register (BAR) is
01: The read address pointer (RAR) is
10: The write address pointer (WAR) is
11: The temporary pointer (TMP) is accessed
FIFO Status Selects 1, 0
These bits select the FIFO status to be
accessed by FSTR while the RS bit is 1.
00: The valid data byte number (DATATN) is
01: The free area byte number (FREEN) is
10: The read start address (NRA) is accessed
11: The write start address (NWA) is accessed
To access NWA, NRA, FREEN, or DATATN
while the RS bit is 0, write 1 to the RS bit twice.
accessed by FSTR
accessed by FSTR
accessed by FSTR
by FSTR
accessed by FSTR
accessed by FSTR
by FSTR
by FSTR