s908qc16g0cdte Freescale Semiconductor, Inc, s908qc16g0cdte Datasheet - Page 141

• Manufacturer Part Number: s908qc16g0cdte
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

15.3.1.1 Normal Monitor Mode
RST and OSC1 functions will be active on the PTA3 and PTA5 pins respectively as long as V
applied to the IRQ pin. If the IRQ pin is lowered (no longer V
monitor mode, but the pin functions will be determined by the settings in the configuration registers (see
Chapter 5 Configuration Register (CONFIG)
V
IRQEN is set in the CONFIG2 register.
15.3.1.2 Monitor Vectors
In monitor mode, the MCU uses different vectors for reset, SWI (software interrupt), and break interrupt
than those for user mode. The alternate vectors are in the $FE page instead of the $FF page and allow
code execution from the internal monitor firmware instead of user code.
Freescale Semiconductor
Function
[Pin No.]
TST
MON08
Monitor
Normal
Mode
1. PTA0 must have a pullup resistor to V
2. Communication speed in the table is an example to obtain a baud rate of 9600. Baud rate using external oscillator is bus
3. External clock is a 9.8304 MHz oscillator on OSC1.
4. Lowering V
5. X = don’t care
6. MON08 pin refers to P&E Microcomputer Systems’ MON08-Cyclone 2 by 8-pin connector.
User
frequency / 256 and baud rate using internal oscillator is bus frequency / 335.
was lowered. With V
(PTA2)
V
V
V
IRQ
V
DD
[6]
TST
TST
SS
TST
to
once monitor mode is entered allows clock source to be controlled by the OSCSC register.
(PTA3)
RST
RST
V
[4]
X
DD
Table 15-1. Monitor Mode Signal Requirements and Options
Vector
Reset
TST
—
X
X
lowered, the BIH and BIL instructions will read the IRQ pin state only if
Communi-
MC68HC08QY/QT Family Data Sheet, Rev. 2
cation
Serial
PTA0
COM
[8]
X
1
DD
OSC1
V
NC
NC
NC
NC
NC
NC
in monitor mode.
DD
MOD0
PTA1 PTA4
[12]
Selection
11
13
15
1
X
1
3
5
7
9
and
Mode
MOD1
[10]
11.8.1 Oscillator Status and Control
10
12
14
16
X
0
2
4
6
8
Disabled
Enabled
GND
RST
IRQ
PTA0
PTA4
PTA1
NC
NC
COP
—
TST
External
9.8304
) then the MCU will still be operating in
Clock
OSC1
MHz
[13]
X
Communication
Frequency
Speed
2.4576
MHz
Bus
—
X
Baud
Rate
9600
Monitor Module (MON)
—
X
Register) when
Provide external
clock at OSC1.
Comments
TST
is
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