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6-12
MSM66591/ML66592 User's Manual
Chapter 6 Port Functions
6.4
Port 1 (P1)
Port 1 (P1_0–P1_7) is an 8-bit I/O port. Input or output can be specified for each bit by
the Port 1 mode register (P1IO).
In addition to the port function, a secondary function (high address output of external
program memory) is assigned to Port 1. If the
EA
pin is set to "L" level, Port 1 operates as
an address bus (high address output pin) of the external program memory.
If the
OE
pin (pin 71) is in "L" level when Port 1 is in output status, Port 1 outputs "H" or
"L" level, but if the
OE
pin is in "H" level, Port 1 goes into high impedance status.
Figure 6-7 shows the configuration of the Port 1 data register (P1) and the Port 1 mode
register (P1IO).
Figure 6-7 Configuration of P1, P1IO
If a read instruction is executed to P1 in which input is specified (P1IOn = "0") by P1IO,
the content of the pin is read. If a read instruction is executed to P1 in which output is
specified (P1IOn = "0"), the content of the port data register is read. If an arithmetic
instruction, increment instruction, or instruction of that type (read-modify-write instruc-
tion) is executed to P1, the content of the pin or port data register is read according to
specification by P1IO (in the case of reading), and data is written to the port data register
(in the case of writing).
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), Port 1 becomes a high
impedance input port (P1IO = 00H). The content of P1 becomes 00H.
P1_7
P1_6
P1_5
P1_4
P1_3
P1_2
P1_1
P1_0
7
6
5
4
3
2
1
0
P1
P1IO7
P1IO6
P1IO5
P1IO4
P1IO3
P1IO2
P1IO1
P1IO0
7
6
5
4
3
2
1
0
P1IO
P1_n = input
0
P1_n = output
1
n = 0–7
Содержание ML66592
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002 ...
Страница 15: ...Contents 12 ...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1 ...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2 ...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3 ...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture ...
Страница 102: ...CPU Control Functions Chapter 4 4 ...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions ...
Страница 112: ...Memory Control Functions Chapter 5 5 ...
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Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions ...
Страница 118: ...Port Functions Chapter 6 6 ...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7 ...
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Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE ...
Страница 156: ...Clock Generation Circuit Chapter 8 8 ...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9 ...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10 ...
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Страница 170: ...Flexible Timer FTM Chapter 11 11 11 ...
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Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM ...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12 ...
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Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function ...
Страница 224: ...PWM Functions Chapter 13 13 ...
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Страница 244: ...Baud Rate Generator Functions Chapter 14 14 ...
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Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions ...
Страница 264: ...Serial Port Functions Chapter 15 15 ...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16 ...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions ...
Страница 382: ...Transition Detector Functions Chapter 17 17 ...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions ...
Страница 388: ...Peripheral Functions Chapter 18 18 ...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19 ...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20 ...
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Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function ...
Страница 408: ...Bus Port Functions Chapter 21 21 ...
Страница 409: ......
Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions ...
Страница 414: ...Expansion Port Chapter 22 22 ...
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Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23 ...
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Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5 ...
Страница 432: ...RAM Monitor Function Chapter 24 24 ...
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Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function ...
Страница 442: ...25 Electrical Characteristics Chapter 25 ...
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Страница 458: ...Package Dimensions Chapter 26 26 ...
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Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions ...
Страница 462: ...Revision History Chapter 27 27 ...
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Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History ...