r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 59

• Manufacturer Part Number: r4f2426
• 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
FP-144LV
88
87
132
134
130
133
131
135
85
86
85
86
H8S/2426, H8S/2426R
TLP-145V
H11
J13
D5
B5
B6
A6
C7
C6
H12
H10
H12
H10
Pin No.
H8S/2424
FP-120BV
73
72
108
110
106
109
107
111
70
71


Rev. 1.00 Sep. 19, 2008 Page 31 of 1270
I/O
Output Strobe signal indicating that
Output Strobe signal indicating that
Input
Output External bus request signal
Output Indicates the bus is released
Output Upper column address strobe
Output Lower column address strobe
Output Upper data mask enable
Output Lower-data mask enable
Function
an 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.
an external address space is
to be written to, and the lower
half (D7 to D0) of the data bus
is enabled.
requests the bus to this LSI.
when the internal bus master
accesses an external space in
the external bus release state.
to the external bus master.
signal for accessing the 16-bit
DRAM space. Also functions
as the column address strobe
signal for accessing the 8-bit
DRAM space.
signal for accessing the 16-bit
DRAM space.
signal for 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.
signal for accessing the 16-bit
continuous synchronous
DRAM interface space.
The external bus master
Section 1 Overview
REJ09B0466-0100