Table of Contents
Advertisement
M16C/62P Group (M16C/62P, M16C/62PT)
Table 8.6 Pin Functions for Each Processor Mode
Processor Mode
PM05 to PM04 Bits
Data Bus Width
BYTE Pin
P0_0 to P0_7
P1_0 to P1_7
P2_0
P2_1 to P2_7
P3_0
P3_1 to P3_3
PM11=0
P3_4 to
P3_7
PM11=1
P4_0 to
PM06=0
P4_3
PM06=1
P4_4
CS0=0
CS0=1
P4_5
CS1=0
CS1=1
P4_6
CS2=0
CS2=1
P4_7
CS3=0
CS3=1
P5_0
PM02=0
PM02=1
P5_1
PM02=0
PM02=1
P5_2
P5_3
P5_4
P5_5
P5_6
P5_7
I/O ports: Function as I/O ports or peripheral function I/O pins.
NOTES :
1. To set the PM01 to PM00 bits are set to "01b" and the PM05 to PM04 bits are set to "11b" (multiplexed bus assigned to the entire CS
space), apply "H" to the BYTE pin (external data bus 8 bits wide). While the CNVSS pin is held "H" (= VCC1), do not rewrite the PM05 to
PM04 bits to "11b" after reset. If the PM05 to PM04 bits are set to "11b" during memory expansion mode, P3_1 to P3_7 and P4_0 to
P4_3 become I/O ports, in which case the accessible area for each CS is 256 bytes.
2. In separate bus mode, these pins serve as the address bus.
3. If the data bus is 8 bits wide, make sure the PM02 bit is set to "0" (RD, BHE, WR).
4. When accessing the area that uses a multiplexed bus, these pins output an indeterminate value during a write.
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
Memory Expansion Mode or Microprocessor Mode
00b(separate bus)
16 bits
8 bits
"H"
D0 to D7
D0 to D7
I/O ports
D8 to D15
A0
A0
A1 to A7
A1 to A7
A8
A8
A9 to A11
A12 to A15
I/O ports
A16 to A19
I/O ports
I/O ports
CS0
I/O ports
CS1
I/O ports
CS2
I/O ports
CS3
WR
(3)
WRL
BHE
WRH
(3)
RD
BCLK
HLDA
HOLD
ALE
RDY
page 52
f o
3
6
4
01b(CS2 is for multiplexed bus and
others are for separate bus)
10b(CS1 is for multiplexed bus and
others are for separate bus)
8 bits
"L"
"H"
(4)
D0 to D7
I/O ports
(2)
A0/D0
A1 to A7
(2)
/D1 to D7
A8
(3)
(3)
Memory Expansion
Mode
11b (multiplexed
bus for the entire
(1)
space)
16 bits
8 bits
"L"
(4)
I/O ports
D0 to D7
(4)
I/O ports
D8 to D15
A0
A0/D0
A1 to A7/D1 to D7
A1 to A7
(2)
/D0 to D6
(2)
A8
A8/D7
I/O ports
I/O ports
I/O ports
WRL
WRH
8. Bus
"H"
(3)
(3)
Advertisement
Table of Contents
