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User’s Manual U11969EJ3V0UM00
39
CHAPTER 2 PIN FUNCTIONS
(v)
SO0, SO1 (Serial Output 0, 1) ... output
These are serial transmit data output pin for the CSI.
Since SO1 is open drain output, connect external pull-up resistor.
(vi)
SI0, SI1 (Serial Input 0, 1) ... input
These are serial receive data input pin for the CSI.
(vii) SCK0, SCK1 (Serial Clock 0, 1) ... 3-state I/O
These pins input/output the serial clock of CSI.
Since SCK1 is open drain output, connect external pull-up resistor to output.
(5) P40 to P47 (Port 4) ... 3-state I/O
These pins constitute an 8-bit I/O port, port 4. They also form a portion of the address/data bus connected
to external memory.
P40 to P47 function not only as I/O port pins but also as time sharing address/data bus pins (AD0 to AD7)
in the control mode (external expansion mode) when an external memory is connected.
Operation mode is specified by the mode specification pin (MODE) and the memory expansion mode register
(MM).
(a) Port mode
P40 to P47 can be set in the input or output port mode in 1-bit units by using port 4 mode register (PM4).
(b) Control mode (External Expansion Mode)
P40 to P47 can be specified as AD0 to AD7 by using the MODE pin and MM register.
(i)
AD0 to AD7 (Address/Data 0 to 7) ... 3-state I/O
These pins constitute a multiplexed address/data bus when the external memory is accessed. They
function as the A0 to A7 output pins of a 24-bit address in the address timing (T1 state), and as the
lower 8-bit data I/O bus pins of 16-bit data in the data timing (T2, TW, T3).
The output status of these pins changes in synchronization with the rising edge of the clock in each
state of the bus cycle. AD0 to AD7 go into a high-impedance state in the idle state (TI).
Since SO1 is open drain output, connect external pull-up resistor to output.
(6) P50 to P57 (Port 5) ... 3-state I/O
These pins constitute an 8-bit I/O port, port 5. They also form a portion of the address/data bus connected
to external memory.
P50 to P57 function not only as I/O port pins but also as multiplexed address/data bus pins (AD8 to AD15)
in the control mode (external expansion mode) when an external memory is connected.
Operation mode is specified by the mode specification pin (MODE) and memory expansion mode register
(MM).
(a) Port mode
P50 to P57 can be set in the input or output port mode in 1-bit units by using port 5 mode register (PM5).
(b) Control mode (External Expansion Mode)
P50 to P57 can be specified as AD8 to AD15 by using the MODE pin and MM register.
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