参数资料
型号: SAF-C515-LN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 109/162页
文件大小: 771K
代理商: SAF-C515-LN
Semiconductor Group
6-7
On-Chip Peripheral Components
C515
6.1.2.3
Port 2 Circuitry
As shown in figure 6-3 and below in figure 6-5, the output drivers of ports 0 and 2 can be switched
to an internal address or address/data bus for use in external memory accesses. In this application
they cannot be used as general purpose I/O, even if not all address lines are used externally. The
switching is done by an internal control signal dependent on the input level at the EA pin and/or the
contents of the program counter. If the ports are configured as an address/data bus, the port latches
are disconnected from the driver circuit. During this time, the P0/P2 SFR remains unchanged. Being
an address/data bus, port 0 uses a pullup FET as shown in figure 6-3. When a 16-bit address is
used, port 2 uses the additional strong pullups p1 (figure 6-6) to emit 1’s for the entire external
memory cycle instead of the weak ones (p2 and p3) used during normal port activity.
Figure 6-5
Port 2 Circuitry
If no external bus cycles are generated using data or code memory accesses, port 0 can be used
for I/O functions.
MCS03228
D
CLK
Bit
Latch
Control
Addr.
MUX
Pin
Read
Latch
Read
Pin
Write to
V
CC
Int. Bus
Port
=1
Q
Internal
Pull Up
Arrangement
相关PDF资料
PDF描述
SAH-C515-LN 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
SAB-C515-LM 8-BIT, 16 MHz, MICROCONTROLLER, PQFP80
SAB-C515C-LM 8-BIT, 10 MHz, MICROCONTROLLER, PQFP80
SAB-XC164CM-8F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
SAB-XC164CM-4F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
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