r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 58

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

Section 1 Overview
Rev. 1.00 Sep. 19, 2008 Page 28 of 1342
REJ09B0467-0100
Type
Clock
Operating
mode
control
Symbol
XTAL
EXTAL
φ
SDRAMφ
*
MD2
MD1
MD0
1
144-Pin
96
97
94
36
1
144
143
H8S/2456, H8S/2456R
145-Pin
F12
F13
F10
M1
B1
A2
A3
Pin No.
81
82
79

1
120
119
H8S/2454
120-Pin
I/O
Input
Input
Output
Output
Input
For connection to a crystal oscillator.
See section 24, Clock Pulse
Generator, for typical connection
diagrams for a crystal resonator and
external clock input.
For connection to a crystal oscillator.
The EXTAL pin can also input an
external clock. See section 24, Clock
Pulse Generator, for typical
connection diagrams for a crystal
resonator and external clock input.
Supplies the system clock to external
devices.
When a synchronous DRAM is
connected, this pin is connected to
the CLK pin of the synchronous
DRAM. For details, see section 6,
Bus Controller (BSC).
These pins set the operating mode.
These pins should not be changed
during operation.
Function