1. Overview
M32C/84 Group (M32C/84, M32C/84T)
1.6 Pin Description
Table 1.6 Pin Description (100-Pin and 144-Pin Packages)
Supply
Voltage
Classsfication
Symbol
I/O Type
Function
Power Supply VCC1, VCC2
VSS
I
-
Apply 3.0 to 5.5V to both VCC1 and VCC2 pins. Apply 0V to the
(1, 2)
VSS pin. VCC1 ≥ VCC2
Analog Power AVCC
I
VCC1
Supplies power to the A/D converter. Connect the AVCC pin to
Supply
AVSS
VCC1 and the AVSS pin to VSS
____________
___________
Reset Input
CNVSS
RESET
CNVSS
I
I
VCC1
VCC1
The microcomputer is in a reset state when "L" is applied to the RESET pin
Switches processor mode. Connect the CNVSS pin to VSS to start up
in single-chip mode or to VCC1 to start up in microprocessor mode
Input to Switch BYTE
External Data Bus
Width(3)
I
VCC1 Switches data bus width in external memory space 3. The data
bus is 16 bits wide when the BYTE pin is held "L" and 8 bits wide
when it is held "H". Set to either. Connect the BYTE pin to VSS
to use the microcomputer in single-chip mode
Bus Control
Pins(3)
D0 to D7
I/O
I/O
VCC2
Inputs and outputs data (D0 to D7) while accessing an external
memory space with separate bus
D8 to D15
VCC2
Inputs and outputs data (D8 to D15) while accessing an external
memory space with 16-bit separate bus
A0 to A22
O
O
VCC2
VCC2
VCC2
Outputs address bits A0 to A22
______
A23
Outputs inversed address bit A23
A0/D0 to
A7/D7
I/O
Inputs and outputs data (D0 to D7) and outputs 8 low-order
address bits (A0 to A7) by time-sharing while accessing an
external memory space with multiplexed bus
A8/D8 to
A15/D15
I/O
VCC2
Inputs and outputs data (D8 to D15) and outputs 8 middle-order
address bits (A8 to A15) by time-sharing while accessing an
external memory space with 16-bit multiplexed bus
______
______
_______
_______
CS0 to CS3
O
O
VCC2
VCC2
Outputs CS0 to CS3 that are chip-select signals specifying an external space
________ ______ _____ ________
______
________
WRL
Outputs WRL, _W___R___H__, (WR, _B__H___E__) and RD signals. WRL and
/ WR
_________
_________
______ _______
WRH / _B__H___E__
WRH can be switched with WR and BHE by program
________ _____
_____
RD
WRL, _W___R___H__ and RD selected:
If external data bus is 16 bits wide, data is written to an even
________
address in external memory space when WRL is held "L".
Data is written to an odd address when _W___R___H__ is held "L".
_____
Data is read when RD is held "L".
______
_____
WR, _B__H___E__ and RD selected:
______
Data is written to external memory space when WR is held "L".
_____
Data in an external memory space is read when RD is held "L".
An odd address is accessed when _B__H___E__ is held "L".
_____
Select _W___R__, _B__H___E__ and RD for external 8-bit data bus.
ALE
O
I
VCC2 ALE is a signal latching the address
__________
HOLD
VCC2
VCC2
The microcomputer is placed in a hold state while the _H__O___L__D__ pin is held "L"
Outputs an "L" signal while the microcomputer is placed in a hold state
__________
HLDA
O
I
________
RDY
VCC2 Bus is placed in a wait state while the _R__D___Y__ pin is held "L"
I : Input
O : Output
I/O : Input and output
NOTES:
1. VCC1 is hereinafter referred to as VCC unless otherwise noted.
2. Apply 4.2 to 5.5V to the VCC1 and VCC2 pins when using M32C/84T. VCC1=VCC2.
3. Bus cotrol pins in M32C/84T cannot be used.
Page 15
Rev. 1.21 Jul. 08, 2005
of 85
RENESAS [ RENESAS TECHNOLOGY CORP ]
