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Revision 1.2
- 2 -
24 October 2000
MTU8B54E/55E/56E/57E
MYSON
TECHNOLOGY
1.0 PIN CONNECTION
2.0 PIN DESCRIPTIONS
PA2
PA3
PA1
PA0
OSCO
OSCI
Vdd
Vss
T0CKI
MCLR/Vpp
PB0
PB1
PB2
PB3
PB7
PB6
PB5
PB4
1
2
3
4
8
5
7
9
6
18
17
16
15
11
14
12
10
13
MTU8B54E
PA2
PA3
PA1
PA0
OSCO
OSCI
Vdd
Vss
T0CKI
MCLR/Vpp
PB0
PB1
PB2
PB3
PB7
PB6
PB5
PB4
1
2
3
4
8
5
7
9
6
18
17
16
15
11
14
12
10
13
MTU8B55E
N/C
N/C
19
20
21
22
23
24
25
26
27
28
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
MTU8B57E
MTU8B56E
Name
I/O
Descriptions
OSCI
I
RC type: Input pin of RC oscillator
XTAL type: Input terminal of crystal oscillator
OSCO
O
RC type: OSCO outputs with 1/4 frequency of OSCI to denotes the cycle
rate for instruction.
XTAL type: Output terminal of crystal oscillator
T0CKI/SCL
I
Input pin of real time counter/clock. Must be tied to Vss or Vdd if not in use.
MCLR/Vpp
I
Input pin for device reset or high voltage programming input for EPROM. If
this pin is low, the device is reset.
In programmimg mode, this pin is connected to 12V. In normal operating
mode, this pin must not exceed Vdd to avoid entering unintended program-
ming mode.
PA0~PA3
I/O
PA0~PA3 as bi-directional I/O port
PB0~PB7
I/O
PB0~PB7 as bi-directional I/O port
PC0~PC7
I/O
PC0~PC7 as bi-directional I/O port
Vdd
-
Power supply
Vss
-
Ground