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| 型號： | P90CE201 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 16-bit microcontroller |
| 中文描述： | 16位微控制器 |
| 文件頁數(shù)： | 52/77頁 |
| 文件大?。?/td> | 235K |
| 代理商： | P90CE201 |
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August 1993
52
Philips Semiconductors
Product specification
16-bit microcontroller
P90CE201
10 8-BIT GENERAL PORT
The port is configured as a quasi-bidirectional port. A port
pin is set to input mode by writing a logic 1 to the
corresponding General Port Register (GP) bit. This drives a
“hard” logic 1 to the corresponding output pin for a short
period. After this period the logic 1 level is maintained by a
weak pull-up transistor, which can be overwritten by an
external signal.
A read from GP reads the value from the corresponding
General Port Register bit. A read from the General Port
Pad/Register (GPP) reads the value from the corresponding
port input pin. A write to either GP or GPP writes the value
to the port register (GP) from where it is driven to the
corresponding port pins. After RESET the port is set to input
mode. Bits 0 to 3 can be used as high current drive outputs
at a logic 0. Bits 6 and 7 may also be used for I
2
C1 and
therefore no internal pull-ups are implemented.
10.1
8-bit General Port registers
10.1.1
G
ENERAL
P
ORT
R
EGISTER
(GP)
This register is located at address 8000 2073H.
10.1.2
G
ENERAL
P
ORT
P
AD
/R
EGISTER
(GPP)
This register is located at address 8000 2071H.
Fig.35 General Port Register (GP).
bit 7
GP7
bit 6
GP6
bit 5
GP5
bit 4
GP4
bit 3
GP3
bit 2
GP2
bit 1
GP1
bit 0
GP0
Fig.36 General Port Pad/Register (GPP).
bit 7
GPP7
bit 6
GPP6
bit 5
GPP5
bit 4
GPP4
bit 3
GPP3
bit 2
GPP2
bit 1
GPP1
bit 0
GPP0
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