upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 58

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

4.3
58
The ports are controlled by the following four types of registers.
• Port mode registers (PM2 to PM4)
• Port registers (P2 to P4)
• Port mode control register 2 (PMC2)
• Pull-up resistor option registers (PU2 to PU4)
Registers Controlling Port Functions
P4:
PU4:
PM4:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
PM
PU
Port register 4
Pull-up resistor option register 4
Port mode register 4
Read signal
Output latch
PM40-PM47
PU40-PU47
(P40-P47)
PM4
PU4
P4
Figure 4-7. Block Diagram of P40 and P47
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16994EJ3V0UD
V
DD
P-ch
P40-P47