mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 200

• Manufacturer Part Number: mc68hc908qb4
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Development Support
17.3.1.1 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
BIL instructions will read the IRQ pin state only if IRQEN is set in the CONFIG2 register.
If monitor mode was entered with V
IRQ.
200
Function
[Pin No.]
MON08
Monitor
Monitor
Normal
Forced
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.
(PTA2)
V
V
V
IRQ
V
[6]
TST
TST
X
DD
SS
TST
once monitor mode is entered allows the clock source to be controlled by the OSCSC register.
(PTA3)
RST
RST
V
[4]
X
X
X
DD
Table 17-1. Monitor Mode Signal Requirements and Options
Vector
(blank)
(blank)
$FFFF
$FFFF
$FFFF
Reset
Not
—
X
Communi-
cation
Serial
PTA0
(CONFIG)) when V
COM
[8]
X
TST
1
1
1
DD
OSC1
MC68HC908QB8 Data Sheet, Rev. 2
V
NC
NC
NC
NC
NC
NC
in monitor mode.
DD
on IRQ, then the COP is disabled as long as V
MOD0
PTA1 PTA4
[12]
Selection
11
13
15
1
X
X
X
1
3
5
7
9
Mode
MOD1
[10]
10
12
14
16
X
X
X
0
2
4
6
8
TST
Disabled
Disabled
Disabled
Enabled
GND
RST
IRQ
PTA0
PTA4
PTA1
NC
NC
COP
—
was lowered. With V
TST
External
9.8304
9.8304
) then the chip will still be operating in
Clock
OSC1
MHz
MHz
[13]
X
X
Communication
Frequency
(Trimmed)
Speed
3.2 MHz
2.4576
2.4576
MHz
MHz
Bus
—
X
TST
lowered, the BIH and
Freescale Semiconductor
Baud
Rate
9600
9600
9600
—
X
TST
Provide external
clock at OSC1.
Provide external
clock at OSC1.
Internal clock is
active.
is applied to
Comments
TST
is