R01UH0136EJ0210 Rev.2.10
Page 148 of 800
Jul 31, 2012
M16C/64A Group
11. Bus
Table 11.8
Pin Functions for Each Processor Mode
Processor Mode
Memory Expansion Mode or Microprocessor Mode
Memory
Expansion Mode
Bits PM05 to PM04
00b (separate bus)
01b (
CS2
is for multiplexed bus and
the others are for separate bus)
10b (
CS1
is for multiplexed bus and
the others are for separate bus)
11b (the entire
CS
space is for
multiplexed bus)
(1, 2, 3)
Data bus width
BYTE Pin
8 bits
High
16 bits
Low
8 bits
High
16 bits
Low
8 bits
High
P0_0 to P0_7
D0 to D7
D0 to D7
D0 to D7
(6)
D0 to D7
(6)
I/O ports
P1_0 to P1_7
I/O ports
D8 to D15
I/O ports
D8 to D15
(6, 7)
I/O ports
P2_0
A0
A0
A0/D0
(4)
A0
A0/D0
P2_1 to P2_7
A1 to A7
A1 to A7
A1 to A7
/D1 to D7
(4)
A1 to A7
/D0 to D6
(4)
A1 to A7
/D1 to D7
P3_0
A8
A8
A8
A8/D7
(4)
Undefined value
is output
P3_1 to P3_3
A9 to A11
I/O ports
P3_4 to P3_7
PM11 = 0
A12 to A15
I/O ports
PM11 = 1
I/O ports
P4_0 to P4_3
PM06 = 0
A16 to A19
I/O ports
PM06 = 1
I/O ports
P4_4
CS0 = 0
I/O ports
CS0 = 1
CS0
P4_5
CS1 = 0
I/O ports
CS1 = 1
CS1
P4_6
CS2 = 0
I/O ports
CS2 = 1
CS2
P4_7
CS3 = 0
I/O ports
CS3 = 1
CS3
P5_0
PM02 = 0
WR
PM02 = 1
−
(5)
WRL
−
(5)
WRL
−
(5)
P5_1
PM02 = 0
BHE
PM02 = 1
−
(5)
WRH
−
(5)
WRH
−
(5)
P5_2
RD
P5_3
BCLK
P5_4
HLDA
P5_5
HOLD
P5_6
ALE
P5_7
RDY
I/O port: Functions as I/O ports or peripheral function I/O pins.
PM11: Bit in the PM1 register
PM06, PM05 to PM04, PM02: Bits in the PM0 register
CS3 to CS0: Bits in the CSR register
Notes:
1.
When setting bits PM05 and PM04 to 11b (multiplexed bus assigned to the entire
CS
space) while bits
PM01 and PM00 are 01b (memory expansion mode), apply a high to the BYTE pin (external data bus 8
bits wide).
2.
While the CNVSS pin is driven high (= VCC1), do not set bits PM05 to PM04 to 11b.
3.
When bits PM05 to PM04 are set to 11b in 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.
4.
In separate bus mode, these pins serve as the address bus.
5.
When the data bus is 8 bits wide, set the PM02 bit to 0 (
RD
,
BHE
,
WR
).
6.
When accessing an area using a multiplexed bus, these pins output an undefined value while writing.
7.
Do not use D8 to D15 with multiplexed bus.
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