
10-31
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10
10.7.2 Port E Registers
(1) Port E direction register (PEDIR)
PEDIR is a 4-bit special function register (SFR) which specifies the port input/output direction
for each bit. Pins corresponding to PEDIR bits set to "0" are input, and those corresponding
to bits set to "1" are output.
At system reset the port E direction register is set to "0", and port E is initialized to input mode.
PE3DIR
PE2DIR
PE1DIR
PE0DIR
PEDIR (03FH)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port E input/output setting
0: Input (initial value)
1: Output
(2) Port E data register (PED)
PED is a 4-bit special function register used to set the output values for port E.
When the port E direction register (PEDIR) is set to "1" and the output mode is selected, the
content of the PED is output to port E.
The port E pin levels are read when PED is read with the port E direction register bits set to
"0" and the input mode selected.
PE3
PE2
PE1
PE0
PED (00EH)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port E output data
At system reset the port E data register is reset to "0". When data is written to the port E data
register, the pin change timing is at the rising edge of the system clock for state 2 of the write
instruction.
Figure 10-13 indicates port change timing.
S1
S2
Old data
New data
CLK
Port E
Write instruction
Figure 10-13 Port E Change Timing
Summary of Contents for ML63326
Page 3: ......
Page 13: ......
Page 14: ...Chapter 1 Overview 1 ...
Page 15: ......
Page 37: ...1 22 ML63326 User s Manual Chapter 1 Overview ...
Page 38: ...Chapter 2 CPU and Memory Spaces 2 ...
Page 39: ......
Page 50: ...CPU Control Functions Chapter 3 3 ...
Page 51: ......
Page 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Page 58: ...Interrupt INT326 Chapter 4 4 ...
Page 59: ......
Page 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Page 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
Page 73: ......
Page 83: ...5 10 ML63326 User s Manual Chapter 5 Clock Generator Circuit OSC ...
Page 84: ...Time Base Counter TBC Chapter 6 6 ...
Page 85: ......
Page 90: ...Timers TIMER Chapter 7 7 ...
Page 91: ......
Page 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Page 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
Page 117: ......
Page 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Page 122: ...Chapter 9 9 Watchdog Timer WDT ...
Page 123: ......
Page 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
Page 129: ......
Page 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
Page 171: ......
Page 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Page 180: ...Chapter 12 12 Melody Driver MELODY63K ...
Page 181: ......
Page 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Page 196: ...13 Chapter 13 Voice Synthesis ...
Page 197: ......
Page 228: ...14 Chapter 14 Shift Register SFT ...
Page 229: ......
Page 236: ...15 Chapter 15 LCD Driver LCD ...
Page 237: ......
Page 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
Page 251: ......
Page 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Page 256: ...Chapter 17 17 Power Supply Circuit POWER ...
Page 257: ......
Page 260: ...Appendixes ...
Page 261: ......
Page 321: ...Appendix 60 ML63326 User s Manual Appendix G ...