m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 342

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 4.2.3. Level of BYTE pin and external data bus width
4.2.3 R/W Modes
C h i p s e l e c t c o n t r o l r e g i s t e r
Chip select expansion register
b 7
b 7
________ ______
The read/write signal that is output when accessing an external area can be selected between the RD/
BHE/WR and the RD/WRH/WRL modes by setting the R/W mode select bit (bit 2) of the processor mode
register 0 (address 0004
the (RD/WRH/WRL) to access a 16-bit wide RAM.
When the M30245 is reset, the RD/BHE/WR mode is selected by default. To switch over the R/W mode,
change the RD/BHE/WR to the RD/WRH/WRL mode before accessing an external RAM.
Refer to the connection examples of RD/BHE/WR and RD/WRH/WRL shown in Section 4.3, “Connection
Examples.”
b 6
b 6
_____ _________ ________
b 5
b 5
b 4
b 4
_____ _______ ______
b 3
b 3
b 2
b 2
page 333 of 354
_____ _________ ________
b 1
b 1
b 0
b 0
N o t e 1 : S e t C S E i W b i t s ( i = 0 t o 3 ) a f t e r s e t t i n g t h e c o r r e s p o n d i n g C S i W b i t ( i = 0 t o 3 ) o f t h e C S R
16
B i t s y m b o l
B i t s y m b o l
). Use the (RD/BHE/WR) mode to access an 8-bit and a 16-bit wide RAM, and
C S 0
C S 1
C S 2
C S 3
C S 0 W
CS1W
CS2W
C S 3 W
CSE0W
C S E 1 W
C S E 2 W
C S E 3 W
r e g i s t e r t o “ 0 ” . W h e n C S i W b i t s a r e s e t t o “ 1 ” , C S E i W b i t s m u s t b e r e t u r n e d t o “ 0 0
S y m b o l
Symbol
C S R
CSE
_____ ________ ______
_____ _________ ________
_____ ________ ______
_____ ________ ______
C S 0 o u t p u t e n a b l e b i t
C S 1 o u t p u t e n a b l e b i t
C S 2 o u t p u t e n a b l e b i t
C S 3 o u t p u t e n a b l e b i t
C S 0 w a i t b i t
C S 1 w a i t b i t
CS2 wait bit
CS3 wait bit
CS0 wait expansion bit
C S 1 w a i t e x p a n s i o n b i t
C S 2 w a i t e x p a n s i o n b i t
CS3 wait expansion bit
B i t n a m e
B i t n a m e
A d d r e s s
Address
001B
0 0 0 8
_____ _________ ________
1 6
16
W h e n r e s e t
When reset
0 : C h i p s e l e c t o u t p u t d i s a b l e d
1 : C h i p s e l e c t o u t p u t e n a b l e d
0 : W a i t s t a t e i n s e r t e d
1 : N o w a i t s t a t e
0 0 : 1 W a i t s t a t e
0 1 : 2 W a i t s t a t e s
1 0 : 3 W a i t s t a t e s
1 1 : I n h i b i t e d
0 1
00
( N o r m a l p o r t p i n )
16
1 6
Function
F u n c t i o n
4. External Buses
2
”.
R W
R W
_____