M16C6C_15 Datasheet, PDF (11/100 Pages) Renesas Technology Corp – RENESAS MCU

M16C/6C Group
1. Overview
1.6 Pin Functions
Table 1.6 Pin Functions (1/3)
Signal Name
Power supply
input
Pin Name
VCC1,
VCC2, VSS
I/O Power Supply
Description
Apply 2.7 to 5.5 V to pins VCC1 and VCC2 (VCC1 ≥ VCC2).
I
-
Input 0 V to VSS.⁽¹⁾
Analog power
supply input
Reset input
CNVSS
AVCC, AVSS I
RESET
I
CNVSS
I
VCC1
VCC1
VCC1
This is the power supply for the A/D converter. Connect the
AVCC pin to VCC1, and connect the AVSS pin to VSS.
Driving this pin low resets the MCU.
Input pin to switch processor modes. Connect the CNVSS
pin to VSS via a resistor.
D0 to D7 I/O
VCC2
Inputs or outputs data (D0 to D7) while accessing an
external area with a separate bus.
A0 to A19
O
VCC2 Outputs address bits A0 to A19.
A0/D0 to
A7/D7
I/O
CS0 to CS3 O
Bus control pins
WR
BHE
O
RD
VCC2
VCC2
VCC2
Inputs or outputs data (D0 to D7) and outputs address bits
(A0 to A7) by timesharing, while accessing an external area
with an 8-bit multiplexed bus.
Outputs chip-select signals CS0 to CS3 to specify an
external area.
Outputs WR, BHE, and RD signals.
• Data is written to an external area when WR is driven low.
Data in an external area is read when RD is driven low. An
odd address is accessed when BHE is driven low.
ALE
O
VCC2 Outputs an ALE signal to latch the address.
HOLD
I
VCC2
HOLD input is unavailable. Connect the HOLD pin to VCC2
via a resistor (pull-up).
HLDA
O
VCC2 In a hold state, HLDA outputs a low-level signal.
RDY
I
VCC2
The MCU bus is placed in a wait state while the RDY pin is
driven low.
Power supply: VCC2 is used to supply power to the external bus associated pins. The dual power supply configuration
allows VCC2 to interface at a different voltage than VCC1.
Note:
1. VCC means VCC1 unless otherwise noted.
R01DS0034EJ0210 Rev.2.10
Jul 31, 2012
Page 11 of 96