CHAPTER 2 PIN FUNCTIONS
User’s Manual U13850EJ6V0UD
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(10) P100 to P107 (Port 10) ··· 3-state I/O
P100 to P107 constitute an 8-bit I/O port that can be set to input or output in 1-bit units.
P100 to P107 can also function as a real-time output port, an address bus (A5 to A12) when memory is
expanded externally, key return input, and IEBus data I/O (V850/SB2 only).
P100 to P107 can be selected as normal output or N-ch open-drain output.
(a) Port function
P100 to P107 can be set to input or output in 1-bit units using the port 10 mode register (PM10).
(b) Alternate functions
(i)
RTP0 to RTP7 (Real-time output port 0 to 7) ··· output
These pins comprise a real-time output port.
(ii)
A5 to A12 (Address bus 5 to 12) ··· output
These comprise the address bus that is used for external access. These pins operate as the A5 to A12
bit address output pins within a 22-bit address. The output changes in synchronization with the rising
edge of the clock in the T1 state of the bus cycle. When the timing sets the bus cycle as inactive, the
previous bus cycle’s address is retained.
(iii) KR0 to KR7 (Key return 0 to 7) ... input
These are key return input pins. Their operations are specified by the key return mode register (KRM).
(iv) IERX (IEBus receive data) ... input
This is an IEBus data input signal. This pin is only available in the V850/SB2.
(v)
IETX (IEBus transmit data) ... output
This is an IEBus data output signal. This pin is only available in the V850/SB2.
Содержание V850/SB1
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