參數(shù)資料
型號(hào): PSD4235G2
英文描述: Flash In-System-Programmable Peripherals for 16-Bit MCUs(用于16位MCU的閃速在系統(tǒng)可編程外圍芯片)
中文描述: Flash在系統(tǒng)可編程外設(shè)的16位微控制器(用于16位微控制器的閃速在系統(tǒng)可編程外圍芯片)
文件頁(yè)數(shù): 61/114頁(yè)
文件大?。?/td> 567K
代理商: PSD4235G2
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Beta Information
PSD4000 Series
57
The
PSD4000
Functional
Blocks
(cont.)
RD
PSEL0
PSEL1
PSEL
VM REGISTER BIT 7
WR
PF0-PF7
D0-D7
*
DATA BUS
Figure 25. Peripheral I/OMode
9.4.3 Port Configuration Registers (PCRs)
Each port has a set of PCRs used for configuration. The contents of the registers can be
accessed by the microcontroller through normal read/write bus cycles at the addresses
given in Table 6. The addresses in Table 6 are the offsets in hex from the base of the
CSIOP register.
The pins of a port are individually configurable and each bit in the register controls its
respective pin. For example, Bit 0 in a register refers to Bit 0 of its port. The three PCRs,
shown in Table 22, are used for setting the port configurations. The default power-up state
for each register in Table 22 is 00h.
Register Name
Port
MCU Access
Control
Direction
Drive Select*
E,F,G
A,B,C,D,E,F,G
A,B,C,D,E,F,G
Write/Read
Write/Read
Write/Read
Table 22. Port Configuration Registers
*
NOTE:
See Table 26 for Drive Register bit definition.
9.4.2.8 MCU Reset Mode
Port F and G can be configured to operate in
MCU Reset
mode. This mode is available
when PSD is configured for the Motorola 16-bit 683XX and HC16 family and is active only
during reset.
At the rising edge of the Reset input, the MCU reads the logic level on the Data Bus D15-0
pins. The MCU then configures some of its I/O pin functions according to the logic level
input on the data bus lines. Two dedicated buffers are usually enabled during reset to drive
the data bus lines to the desired logic level.
The PSD4235G2 can replace the two buffers by configuring Port F and G to operate in
MCU Reset Mode. In this mode, the PSD will drive the pre-defined logic level or data
pattern onto the MCU Data Bus when reset is active and there is no ongoing bus cycle.
After reset, Port F and G return to the normal Data Port Mode.
The MCU Reset Mode is enabled and configured in PSDsoft. The user defines the logic
level (data pattern) that will be driven out from Port F and G during reset.
*
NOTE
D8-D15 for 16-bit Motorola MCU.
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