ML63611 User’s Manual
Chapter 10 Ports (INPUT, I/O PORT)
10 – 28
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
10.7.2 Port E Registers
(1) Port E data register (PED)
PED is a 4-bit special function register used to set the output values for port E.
When a bit in the port E direction register (PEDIR) is set to “1” to select the output mode, the content of the
corresponding bit in the port E data register is output to the port E.
When a bit in the port E data register is read with the corresponding PEDIR bit set to output, the value of the
bit in the port E data register is read.
When a bit in the port E data register is read with the corresponding PEDIR bit set to “0” (input mode), the
level of the corresponding pin of port E is read.
At system reset all bits in the port E data register (PED) are 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 10-15 indicates port E change timing.
Figure 10-15 Port E Change Timing
(2) 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 PEDIR bits set to “1” are
output.
At system reset all bits in the port E direction register are set to “0”, and port E is initialized to input mode.
S1
S2
Old data
New data
CLK
Port E
Write instruction
PE3
PE2
PE1
PE0
PED (00EH)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port E output data
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
Содержание ML63611
Страница 9: ...Chapter 1 Overview...
Страница 33: ...Chapter 2 CPU and Memory Spaces...
Страница 42: ...Chapter 3 CPU Control Functions...
Страница 49: ...Chapter 4 Interrupt INT...
Страница 62: ...Chapter 5 Clock Generator Circuit OSC...
Страница 71: ...Chapter 6 Time Base Counter TBC...
Страница 75: ...Chapter 7 Timers TIMER...
Страница 99: ...Chapter 8 100 Hz Timer Counter 100HzTC...
Страница 103: ...Chapter 9 Watchdog Timer WDT...
Страница 108: ...Chapter 10 Ports INPUT I O PORT...
Страница 140: ...Chapter 11 Melody Driver MELODY...
Страница 152: ...Chapter 12 Serial Port SIO...
Страница 179: ...Chapter 13 LCD Driver LCD...
Страница 200: ...Chapter 14 Battery Low Detect Circuit BLD...
Страница 204: ...Chapter 15 Power Supply Circuit POWER...
Страница 215: ...Chapter 16 A D Converter ADC...
Страница 238: ...Appendixes...
Страница 271: ...ML63611 User s Manual First Edition May 2001 Second Edition June 2001 2001 Oki Electric Industry Co Ltd PEUL63611 02...