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Rev.2.10 Apr 14, 2006 page 51 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 7. Bus
Table 7.6 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
11b
others are for separate bus)
(multiplexed bus
for
_______
10b (CS1 is for multiplexed bus and
the entire space)
(1)
others are for separate bus)
Data bus width 8 bits 16 bits 8 bits 16 bits 8 bits
BYTE pin H”“L”“H”“L H
P0_0 to P0_7 D0 to D7 D0 to D7
(4)
I/O ports
P1_0 to P1_7 I/O ports D8 to D15 I/O ports
D8 to D15
(4)
I/O ports
P2_0 A0 A0/D0
(2)
A0 A0/D0
P2_1 to P2_7 A1 to A7 A1 to A7 A1 to A7
A1 to A7/D1 to D7
/D1 to D7
(2)
/D0 to D6
(2)
P3_0 A8 A8/D7
(2)
A8
P3_1 to P3_3 A9 to A11 I/O ports
P3_4 PM11 = 0 A12 to A15 I/O ports
to P3_7 PM11 = 1 I/O ports
P4_0 PM06 = 0 A16 to A19 I/O ports
to P4_3 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
-
(3)
________
WRL
-
(3)
________
WRL
-
(3)
P5_1 PM02 = 0
________
BHE
PM02 = 1
-
(3)
_________
WRH
-
(3)
_________
WRH
-
(3)
P5_2
_____
RD
P5_3 BCLK
P5_4
__________
HLDA
P5_5
__________
HOLD
P5_6 ALE
P5_7
________
RDY
I/O ports: Function as I/O ports or peripheral function I/O pins.
NOTES:
1. For setting bits PM01 to PM00 to 01b (memory expansion mode) and bits PM05 to PM04 to 11b
_____
(multiplexed bus assigned to the entire CS space), apply H to the BYTE pin (external data bus is an
8-bit width). While the CNVSS pin is held H (VCC), do not rewrite bits PM05 to PM04 to 11b after
reset. If bits PM05 to PM04 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-bit width, 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 undefined value during
a write.
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