3 pin functions – Renesas H8S/2111B User Manual
Page 43
Rev. 1.00, 05/04, page 9 of 544
1.3.3 Pin
Functions
Table 1.2
Pin Functions
Pin
No.
Type Symbol
TFP-144
I/O Name
and
Function
VCC
1, 86
Input
Power supply pin. Connect the pin to the
system power supply.
VCL
13
Input
Power supply pin. Connect the pin to VCC.
VCCB
36
Input
The power supply for the port A input/output
buffer.
Power
VSS
7, 42, 95,
111, 139
Input
Ground pin. Connect to the system power
supply (0 V).
XTAL 143 Input
EXTAL 144
Input
Pins for connection to crystal resonators. The
EXTAL pin can also input an external clock.
See section 19, Clock Pulse Generator, for
typical connection diagrams.
φ
18
Output
Supplies the system clock to external
devices.
EXCL
18
Input
Input a 32.768 kHz external subclock.
X1 140 Input
Leave
open.
Clock
X2 141 Input
Leave
open.
Operating
mode control
MD1
MD0
9
10
Input
These pins set the operating mode. These
pins should not be changed while the MCU is
operating.
RES
8
Input
Reset pin.
When this pin becomes low, the chip is reset.
RESO
142
Output
Outputs reset signal to external device.
System
control
STBY
12
Input
When this pin is driven low, a transition is
made to hardware standby mode.
NMI
11
Input
Input pin for a nonmaskable interrupt request.
Interrupt
signals
IRQ0 to
IRQ7
22 to 24,
133 to 135,
84, 85
Input
These pins request a maskable interrupt.