CHAPTER 2 PIN FUNCTIONS
User’s Manual U12688EJ4V0UM00
53
(5) P40 to P47 (Port 4) ··· 3-state I/O
Port 4 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Besides functioning as a port, in the control mode (external expansion mode) it operates as a data bus (D0 to
D7) when memory is externally expanded.
The operation mode is specified by the mode specification pins (MODE0 to MODE3) and the memory
expansion mode register (MM).
(a) Port mode
P40 to P47 can be set to input or output in bit units by the port 4 mode register (PM4).
(b) Control mode (External expansion mode)
P40 to P47 can be set as D0 to D7 by using the MODE0 to MODE3 pins and MM register.
(i)
D0 to D7 (Data) ··· 3-state I/O
These pins constitute the data bus that is used for external access. They operate as the lower 8-bit
input/output bus pins for 16-bit data. The output changes in synchronization with the falling of the
clock in the T1 state CLKOUT signal of the bus cycle. In the idle state (TI), the impedance becomes
high.
(6) P50 to P57 (Port 5) ··· 3-state I/O
Port 5 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Besides functioning as an I/O port, in the control mode (external expansion mode) it operates as a data bus
(D8 to D15) when memory is externally expanded.
The operation mode is specified by the mode specification pins (MODE0 to MODE3) and the memory
expansion mode register (MM).
(a) Port mode
P50 to P57 can be set to input or output in bit units by the port 5 mode register (PM5).
(b) Control mode (External expansion mode)
P50 to P57 can be set as D8 to D15 by using the MODE0 to MODE3 pins and MM register.
(i)
D8 to D15 (Data) ··· 3-state I/O
These pins constitute the data bus that is used for external access. They operate as the higher 8-bit
input/output bus pins for 16-bit data. The output changes in synchronization with the falling of the
clock in the T1 state CLKOUT signal of the bus cycle. In the idle state (TI), the impedance becomes
high.
Содержание V850E/MS1 UPD703100
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