h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 47

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Type
Clock
Operating mode
control
System control
Interrupts
Address bus
Symbol
OSC1
OSC2
φ
MD2 to MD0
RES
STBY
FWE
NMI
IRQ5 to IRQ0 Input
A23 to A0
Input
Input
Input
Input
I/O
Input
Output
Input
Input
Output
Name and Function
Subclock: Connects to a 32 kHz crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
Subclock: Connects to a 32 kHz crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
System clock: Supplies the system clock to an external
device.
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/2646 Group 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.
MD1
0
1
0
1
Rev. 5.00 Sep 22, 2005 page 21 of 1136
MD0
0
1
0
1
0
1
0
1
Operating Mode
—
—
—
—
Mode 4
Mode 5
Mode 6
Mode 7
Section 1 Overview
REJ09B0257-0500