參數(shù)資料
型號: ST72121J4T1/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, TQFP-44
文件頁數(shù): 18/87頁
文件大?。?/td> 1365K
代理商: ST72121J4T1/XXX
25/87
ST72121
I/O PORTS (Cont’d)
Figure 18
. I/O Block Diagram
Table 9. Port Mode Configuration
Legend:
0 -
present, not activated
1 -
present and activated
Notes:
– No OR Register on some ports (see register map).
– ADC Switch on ports with analog alternate functions.
DR
DDR
LATCH
DA
TA
B
U
S
DR SEL
DDR SEL
VDD
PAD
ANALOG
SWITCH
ANALOG ENABLE
(ADC)
M
U
X
ALTERNATE
ALTERNATE ENABLE
COM
MON
AN
ALO
G
RA
IL
ALTERNATE
M
U
X
ALTERNATE INPUT
PULL-UP (SEE TABLE BELOW)
OUTPUT
P-BUFFER
(SEE TABLE BELOW)
N-BUFFER
1
0
1
0
OR
LATCH
OR SEL
FROM
OTHER
BITS
EXTERNAL
PULL-UP
CONDITION
ENABLE
GND
(SEE TABLE BELOW)
(SEE NOTE BELOW)
CMOS
SCHMITT TRIGGER
SOURCE (EIx)
INTERRUPT
POLARITY
SEL
Configuration Mode
Pull-up
P-buffer
Floating
0
Pull-up
1
0
Push-pull
0
1
True Open Drain
not present
Open Drain (logic level)
0
25
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