r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 61

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Type
Bus
control
Symbol
HWR
LWR
BREQ-A
BREQ-B
BREQO-A
BREQO-B
BACK-A
BACK-B
UCAS
LCAS
DQMU *
DQML *
1
1
144-Pin
88
87
132
134
130
133
131
135
85
86
85
86
H8S/2456, H8S/2456R
145-Pin
H11
J13
D5
B5
B6
A6
C7
C6
H12
H10
H12
H10
Pin No.
73
72
108
110
106
109
107
111
70
71


H8S/2454
120-Pin
I/O
Output Strobe signal indicating that an
Output Strobe signal indicating that an
Input
Output External bus request signal when the
Output Indicates the bus is released to the
Output Upper column address strobe signal
Output Lower column address strobe signal
Output Upper data mask enable signal for
Output Lower-data mask enable signal for
Rev. 1.00 Sep. 19, 2008 Page 31 of 1342
Function
external address space is to be
written to, and the upper half (D15 to
D8) of the data bus is enabled. Also
functions as the write enable signal
for accessing the DRAM space.
external address space is to be
written to, and the lower half (D7 to
D0) of the data bus is enabled.
The external bus master requests the
bus to this LSI.
internal bus master accesses an
external space in the external bus
release state.
external bus master.
for accessing the 16-bit DRAM
space. Also functions as the column
address strobe signal for accessing
the 8-bit DRAM space.
for accessing the 16-bit DRAM
space.
accessing the 16-bit continuous
synchronous DRAM space. Also
functions as the data mask enable
signal for accessing the 8-bit
continuous synchronous DRAM
space.
accessing the 16-bit continuous
synchronous DRAM interface space.
Section 1 Overview
REJ09B0467-0100