M37733 MITSUBISHI [Mitsubishi Electric Semiconductor], M37733 Datasheet - Page 10

• Manufacturer Part Number: M37733
• Description: 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

PROCESSOR MODE
The bits 0 of processor mode register 0 as shown in Figure 8 is used
to select which mode of microprocessor mode, and evaluation chip
mode.
Figure 9 shows functions of P0
The external memory area also changes when the mode changes.
Figure 10 shows the memory map for each mode.
The accessing of the external memory is affected by the BYTE pin,
the bit 2 (wait bit) of processor mode register 0, and bit 0 (wait selection
bit) of processor mode register 1.
Fig. 8 Processor mode register bit configuration
10
7 6 5 4 3 2
0
1
1
0
0
Processor mode register 0
/A
Software reset bit
Reset occurs when this bit is set to “1”
Not used
Processor mode bit
This bit must be “1”
(becomes “1” after reset release)
Wait bit
Interrupt priority detection time selection bit
0 0 : Internal clock
0 1 : Internal clock
1 0 : Internal clock
This bit must be “0”
0 : Microprocessor mode
1 : Evaluation chip mode
0 : Wait
1 : No Wait
0
to P4
7
pins in each mode.
7
4
2
Address
5E
16
• BYTE pin
When accessing the external memory, the level of the BYTE pin is
used to determine whether to use the data bus as 8-bit width or 16-
bit width.
The data bus width is 8 bits when the level of the BYTE pin is “H”,
and P2
The data bus width is 16 bits when the level of the BYTE pin is “L”,
and both P2
D
When accessing the internal memory, the data bus width is always
16 bits regardless of the BYTE pin level.
7 6 5 4 3 2
15
pins become the data I/O pins.
0
/A
16
/D
0
/A
0
16
to P2
/D
0
1
7
to P2
/A
MITSUBISHI MICROCOMPUTERS
0
23
/D
7
Processor mode register 1
16-BIT CMOS MICROCOMPUTER
/A
7
Wait selection bit
pins become the data I/O pins.
23
0 : Wait 0
1 : Wait 1
/D
7
pins and P1
M37733S4BFP
0
/A
8
/D
8
Address
to P1
5F
16
7
/A
15
/