M30622 Mitsubishi, M30622 Datasheet - Page 34

• Manufacturer Part Number: M30622
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

Bus Control
(3) Read/write signals
Figure 1.12.1. Chip select control register
Table 1.12.2. Operation of RD, WRL, and WRH signals
Table 1.12.3. Operation of RD, WR, and BHE signals
Note 1: M30623(80-pin package) can operate only when BYTE = ‘‘H’’.
With a 16-bit data bus (BYTE pin =“L”), bit 2 of the processor mode register 0 (address 0004
combinations of RD, BHE, and WR signals or RD, WRL, and WRH signals. With an 8-bit data bus (BYTE
pin = “H”), use the combination of RD, WR, and BHE signals. (Set bit 2 of the processor mode register 0
(address 0004
After a reset has been cancelled, the combination of RD, WR, and BHE signals is automatically selected.
When switching to the RD, WRL, and WRH combination, do not write to external memory until bit 2 of the
processor mode register 0 (address 0004
Note 1: Before attempting to change the contents of the processor mode register 0, set bit 1 of the protect
Data bus width
Data bus width
(BYTE = “H”)
(BYTE = “L”)
(BYTE = “L”)
Chip select control register
16-bit
b7
8-bit
16-bit
b6
register (address 000A
b5
b4
16
) to “0”.) Tables 1.12.2 and 1.12.3 show the operation of these signals.
_____ ________
b3
RD
b2
H
H
H
H
L
L
L
L
RD
H
H
H
L
Note: In M30623(80-pin package), the chip select signals has no corresponding
_____ _________
b1
b0
_____
_____
external pin. So, this register is invalid.
Bit symbol
WR
16
CS0
CS1
CS2
CS3
CS0W
CS1W
CS2W
CS3W
______
H
H
H
H
L
L
L
L
______
________
Symbol
CSR
WRL
) to “1”.
_____
H
H
L
L
_________
______
Not used
Not used
16
________
BHE
CS0 output enable bit
CS1 output enable bit
CS2 output enable bit
CS3 output enable bit
CS0 wait bit
CS1 wait bit
CS2 wait bit
CS3 wait bit
_________
H
H
L
L
L
L
) has been set (Note 1).
WRH
_____
H
H
L
L
Bit name
_______
34
________
Address
_____
H / L
H / L
0008
A0
H
H
L
L
L
L
Read data
Write 1 byte of data to odd address
Write data to both even and odd addresses
Write 1 byte of data to even address
______
16
_________
Write 1 byte of data to odd address
Read 1 byte of data from odd address
Read 1 byte of data from even address
Read data from both even and odd addresses
Write 1 byte of data
Read 1 byte of data
Write 1 byte of data to even address
Write data to both even and odd addresses
When reset
________
0 : Chip select output disabled
1 : Chip select output enabled
0 : Wait state inserted
1 : No wait state
Status of external data bus
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
01
(Normal port pin)
16
Status of external data bus
Function
Mitsubishi microcomputers
M16C / 62T Group
16
) select the
R
W