h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 79

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Type
Operating mode
control
System control
Interrupts
Address bus
Data bus
Bus control
Symbol
MD2 to MD0
R E S
S T B Y
FWE *
NMI
I R Q 5
A23 to A0
D15 to D0
A S
R D
H W R
to
2
I R Q 0
I/O
Input
Input
Input
Input
Input
Output
I/O
Output
Output
Output
Input
Name and Function
Mode pins: These pins set the operating mode.
The relation between the settings of pins MD2 to MD0
and the operating mode is shown below. These pins
should not be changed while the H8S/2636 is
operating.
MD2
0
1
Reset input: When this pin is driven low, the chip is
reset.
Standby: When this pin is driven low, a transition is
made to hardware standby mode.
Flash write enable: Pin for flash memory use (in
planning stage).
Nonmaskable interrupt: Requests a nonmaskable
interrupt. When this pin is not used, it should be fixed
high.
Interrupt request 5 to 0: These pins request a
maskable interrupt.
Address bus: These pins output an address.
Data bus: These pins constitute a bidirectional data
bus.
Address strobe: When this pin is low, it indicates that
address output on the address bus is enabled.
Read: When this pin is low, it indicates that the
external address space can be read.
High write: A strobe signal that writes to external space
and indicates that the upper half (D15 to D8) of the
data bus is enabled.
MD1
0
1
0
1
Rev. 6.00 Feb 22, 2005 page 19 of 1484
MD0
0
1
0
1
0
1
0
1
Operating Mode
—
—
—
—
Mode 4
Mode 5
Mode 6
Mode 7
Section 1 Overview
REJ09B0103-0600