CM68HC05C4ACFB Motorola / Freescale Semiconductor, CM68HC05C4ACFB Datasheet - Page 92

• Manufacturer Part Number: CM68HC05C4ACFB
• Description: Microcontroller
• Manufacturer: Motorola / Freescale Semiconductor

Operating Modes
11.4 Self-Check Mode
11.4.1 Self-Check Tests
General Release Specification
92
Self-check mode is entered upon the rising edge of RESET if the IRQ pin
is at V
The self-check ROM at mask ROM location $1F00–$1FEF determines
if the MCU is functioning properly. These five tests are performed:
1. I/O — Functional test of ports A, B, and C
2. RAM — Counter test for each RAM byte
3. Timer — Test of counter register and OCF bit
4. SCI — Transmission test checks for RDRF, TDRE, TC, and FE
flags
TST
and the TCAP pin is at logic 1.
Operating Modes
RESET
IRQ
PB3
PB4
PB5
PB6
PB7
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB0
PB1
PB2
V
Figure 11-1. User Mode Pinout
NC
SS
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
26
25
24
23
22
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
PC2
PC3
PC4
PC5
PC6
PC7
V
OSC1
OSC2
TCAP
PD7
PD6/TCMP
PD5/SS
PD4/SCK
PD3/MOSI
PD2/MISO
PD1/TDO
PD0/RDI
PC0
PC1
MC68HC05C4A
DD
MOTOROLA
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Rev. 4.0