CTM8B54E/55E/56E/57E
EPROM-Based 8-Bit CMOS Microcontroller
1.0 PIN CONNECTION
T0CKI
Vdd
N/C
1
2
3
4
5
6
7
8
9
28
27
26
25
24
23
22
21
20
19 PC1
18 PC0
17
16
15 PB5
MCLR/Vpp
OSCI
OSCO
PC7
PC6
PC5
PC4
PC3
PC2
18
17
16
15
14
13
12
11
10
PA2
PA3
T0CKI
MCLR/Vpp
Vss
1
2
3
4
5
6
7
8
9
PA1
PA0
OSCI
OSCO
Vdd
PB7
PB6
PB5
PB4
Vss
N/C
PA0
PA1
PA2
PA3
PB0 10
PB1 11
PB2
PB3
PB4
CTM8B54E
CTM8B56E
CTM8B55E
CTM8B57E
PB0
PB1
PB2
PB3
PB7
PB6
12
13
14
2.0 PIN DESCRIPTIONS
Name
OSCI
I/O
I
Descriptions
RC type: Input pin of RC oscillator
XTAL type: Input terminal of crystal oscillator
RC type: OSCO outputs with 1/4 frequency of OSCI to denotes the cycle
rate for instruction.
OSCO
O
I
XTAL type: Output terminal of crystal oscillator
T0CKI/SCL
Input pin of real time counter/clock. Must be tied to Vss or Vdd if not in use.
Input pin for device reset or high voltage programming input for EPROM. If
this pin is low, the device is reset.
MCLR/Vpp
I
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
PB0~PB7
PC0~PC7
Vdd
I/O
I/O
I/O
-
PA0~PA3 as bi-directional I/O port
PB0~PB7 as bi-directional I/O port
PC0~PC7 as bi-directional I/O port
Power supply
Vss
-
Ground
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN, R.O.C
Email: server@ceramate.com.tw
Tel:886-3-3529445
Fax:886-3-3521052
Http: www.ceramate.com.tw
Rev 1.1 Dec 26,2001
Page 2 of 23
CERAMATE [ CERAMATE TECHNICAL ]
