ml670100 Oki Semiconductor, ml670100 Datasheet - Page 72

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

5.1
5-2
Overview
The I/O ports consist of nine 8-bit ports: PIOn (n=0 - 8). I/O directions are specified at the bit
level. When configured for input, the pins use high-impedance input.
In addition to their primary functions as I/O ports, some pins have secondary functions as
extensions to the external bus and as I/O pins for the on-chip peripherals. The I/O directions for
pins configured for these secondary functions depend of the settings and operation of the
corresponding on-chip peripheral. Table 5.1 lists these secondary functions and I/O directions.
A system reset triggered by the external reset signal (nRST) initializes PIOn pin functions to
the following configurations:
-
-
-
-
A system reset triggered by the Watchdog Timer (WDT) counter overflow signal (WDTOV)
does not affect pin functions. They remain as they were before the reset.
Table 5.1 : Secondary Functions for I/O Port Pins
*1
*2
PIO0[7:0]
PIO1[7:0]
PIO2[7]
PIO2[6]
PIO2[5]
PIO2[4]
PIO2[3]
PIO2[2]
PIO2[1]
PIO2[0]
PIO3[7:0]
PIO4[7:6]
PIO4[5:0]
Port Pin(s)
- “H” level (VDD) input configures the pins as the debugging interface
PIO2[7] and PIO3 to PIO7 have their primary pin functions (I/O) and are configured for
input.
All other I/O port 2 pins (PIO2[6:0]) have their secondary functions.
PIO0 and PIO1 have the functions determined by the input levels during the reset at the
nEA and DBSEL pins, respectively.
PIO8 has the functions determined by the input level of the TEST pin during the reset.
- “L” level (GND) input configures the pins as I/O pins
nEA pin = L level : Secondary function (external address bus)
nEA pin = H level : Primary function (I/O pins)
DBSEL pin = L level : Primary function (I/O pins)
DBSEL pin = H level : Secondary function (external data bus)
XA23 - 16
XD15 - 8
nXWAIT
nCS1
nHB/nWRH
nRAS1
nWH/nCASH
nRAS0
nCAS/nCASL
nWL/nWE
nEIR[7:0]
TMCLK[1:0]
TMIN[5:0]/TMOUT[5:0]
Signal Name(s)
Output
Bi-directional
Input
Output
Output
Output
Output
Output
Output
Output
Input
Input
Bi-directional
Direction
System reset by nRST
Depends on the nEA pin
setting *1
Depends on the DBSEL pin
setting *2
Primary function
Secondary function
Secondary function
Secondary function
Secondary function
Secondary function
Secondary function
Secondary function
Primary function
Primary function
Primary function