M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 59

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 3.1.2 Structure of port Pi (i = 0 to 8) direction register
3.1.1 Direction register
This register determines the input/output direction of the programmable I/O port. Each bit of this register
corresponds one for one to each pin of the microcomputer.
Figure 3.1.2 shows the structure of port Pi (i = 0 to 8) direction register.
b7
b6
b5
b4
b3
b2
b1
b0
Port Pi direction register (i = 0 to 8)
(Addresses 4
Notes 1: Bits 7 to 4 of the port P3 direction register cannot be written (they may be either “0” or “1”) and are
Bit
0
1
2
3
4
5
6
7
2: In the memory expansion mode or the microprocessor mode, fix bits 0 and 1 of the port P4 direction
7703 Group
Fix the following bits which do not have the corresponding pin to “1”.
Corresponding
register to “0”.
fixed to “0” at reading.
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Bit
pin
16
• Bit 3 of port P3 direction register
• Bits 3 to 6 of port P4 direction register
• Bits 0, 1, 6, and 7 of port P6 direction register
• Bits 3 to 6 of port P7 direction register
• Bits 4 and 5 of port P8 direction register
, 5
7702/7703 Group User’s Manual
16
0
1
2
3
4
5
6
7
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
, 8
Bit name
b7
Pi
16
7
, 9
16
Pi
b6
, C
6
16
, D
b5
Pi
5
16
, 10
Pi
b4
4
16
INPUT/OUTPUT PINS
1 : Output mode
0 : Input mode
, 11
Pi
b3
(Functions as an input port)
(Functions as an output port)
3
16
, 14
b2
Pi
3.1 Programmable I/O ports
2
16
Functions
)
Pi
b1
1
Pi
b0
0
At reset
0
0
0
0
0
0
0
0
RW
RW
RW
RW
RW
RW
RW
RW
RW
3–3