參數(shù)資料
型號(hào)： MC68HC08QT2MDWE
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封裝： LEAD FREE, EIAJ, SOIC-8
文件頁數(shù)： 48/176頁
文件大?。?/td> 1124K
代理商： MC68HC08QT2MDWE
Monitor Module (MON)
MC68HC08QY/QT Family Data Sheet, Rev. 2
Freescale Semiconductor
141
15.3.1.1 Normal Monitor Mode
RST and OSC1 functions will be active on the PTA3 and PTA5 pins respectively as long as VTST is
applied to the IRQ pin. If the IRQ pin is lowered (no longer VTST) then the MCU will still be operating in
monitor mode, but the pin functions will be determined by the settings in the configuration registers (see
VTST was lowered. With VTST lowered, the BIH and BIL instructions will read the IRQ pin state only if
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.
Table 15-1. Monitor Mode Signal Requirements and Options
Mode
IRQ
(PTA2)
RST
(PTA3)
Reset
Vector
Serial
Communi-
cation
Mode
Selection
COP
Communication
Speed
Comments
PTA0
PTA1 PTA4
External
Clock
Bus
Frequency
Baud
Rate
Normal
Monitor
VTST
VDD
X1
1
0
Disabled
9.8304
MHz
2.4576
MHz
9600
Provide external
clock at OSC1.
User
VDD to
VSS
X
Enabled
X
MON08
Function
[Pin No.]
VTST
[6]
RST
[4]
—
COM
[8]
MOD0
[12]
MOD1
[10]
—
OSC1
[13]
——
1. PTA0 must have a pullup resistor to VDD in monitor mode.
2. Communication speed in the table is an example to obtain a baud rate of 9600. Baud rate using external oscillator is bus
frequency / 256 and baud rate using internal oscillator is bus frequency / 335.
3. External clock is a 9.8304 MHz oscillator on OSC1.
4. Lowering VTST once monitor mode is entered allows clock source to be controlled by the OSCSC register.
5. X = don’t care
6. MON08 pin refers to P&E Microcomputer Systems’ MON08-Cyclone 2 by 8-pin connector.
NC
1
2
GND
NC
3
4
RST
NC
5
6
IRQ
NC
7
8
PTA0
NC
9
10
PTA4
NC
11
12
PTA1
OSC1
13
14
NC
VDD
15
16
NC
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