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ST72E121 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. ST72E121
Description  8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72E121 Datasheet(HTML) 6 Page - STMicroelectronics

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ST72E121 ST72T121
Table 1. ST72T121Jx Pin Description
Note 1: VPP on EPROM/OTP only.
Pin n
°
QFP44
Pin n
°
SDIP42
Pin Name
Type
Description
Remarks
1
38
PE1/RDI
I/O
Port E1 or SCI Receive Data In
2
39
PB0
I/O
Port B0
External Interrupt: EI2
3
40
PB1
I/O
Port B1
External Interrupt: EI2
4
41
PB2
I/O
Port B2
External Interrupt: EI2
5
42
PB3
I/O
Port B3
External Interrupt: EI2
6
1
PB4
I/O
Port B4
External Interrupt: EI3
7
2
PD0
I/O
Port D0
8
3
PD1
I/O
Port D1
9
4
PD2
I/O
Port D2
10
5
PD3
I/O
Port D3
11
6
PD4
I/O
Port D4
12
7
PD5
I/O
Port D5
13
8
VDD_3
S
Main Power Supply
14
9
VSS_3
S
Ground
15
10
PF0/CLKOUT
I/O
Port F0 or CPU Clock Output
External Interrupt: EI1
16
11
PF1
I/O
Port F1
External Interrupt: EI1
17
12
PF2
I/O
Port F2
External Interrupt: EI1
18
13
PF4/OCMP1_A
I/O
Port F4 or Timer A Output Compare 1
19
14
PF6/ICAP1_A
I/O
Port F6 or Timer A Input Capture 1
20
15
PF7/EXTCLK_A
I/O
Port F7 or External Clock on Timer A
21
VDD_0
S
Main power supply
22
VSS_0
S
Ground
23
16
PC0/OCMP2_B
I/O
Port C0 or Timer B Output Compare 2
24
17
PC1/OCMP1_B
I/O
Port C1 or Timer B Output Compare 1
25
18
PC2/ICAP2_B
I/O
Port C2 or Timer B Input Capture 2
26
19
PC3/ICAP1_B
I/O
Port C3 or Timer B Input Capture 1
27
20
PC4/MISO
I/O
Port C4 or SPI Master In / Slave Out Data
28
21
PC5/MOSI
I/O
Port C5 or SPI Master Out / Slave In Data
29
22
PC6/SCK
I/O
Port C6 or SPI Serial Clock
30
23
PC7/SS
I/O
Port C7 or SPI Slave Select
31
24
PA3
I/O
Port A3
External Interrupt: EI0
32
25
VDD_1
S
Main power supply
33
26
VSS_1
S
Ground
34
27
PA4
I/O
Port A4
High Sink
35
28
PA5
I/O
Port A5
High Sink
36
29
PA6
I/O
Port A6
High Sink
37
30
PA7
I/O
Port A7
High Sink
38
31
TEST/VPP
1)
S
Test mode pin. In the EPROM programming
mode, this pin acts as the programming voltage
input VPP.
This pin must be tied low
in user mode
39
32
RESET
I/O
Bidirectional. Active low. Top priority non maskable interrupt.
40
33
VSS_2
S
Ground
41
34
OSCOUT
O
Input/Output Oscillator pin. These pins connect a parallel-resonant crystal, or
an external source to the on-chip oscillator.
42
35
OSCIN
I
43
36
VDD_2
S
Main power supply
44
37
PE0/TDO
I/O
Port E0 or SCI Transmit Data Out
6


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