参数资料
型号: M37641F8FP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM, PLASTIC, QFP-80
文件页数: 99/140页
文件大小: 1694K
代理商: M37641F8FP
7641 Group
Rev.4.00
Aug 28, 2006
page 59 of 135
REJ03B0191-0400
Fig. 54 Interrupt request circuit of data bus buffer
MASTER CPU BUS INTERFACE
The 7641 group internally has a 2-byte bus interface which control
signals from the host CPU side can operate (slave mode).
This bus interface allows the 7641 group to be directly connected
with a R/W type of CPU bus or a RD and WR separated type of
CPU bus. Figure 56 shows the block diagram of master CPU bus
interface function.
The data bus buffer function I/O pins (P52 – P57, P6, P72–P74)
also function as the normal I/O ports. When the Master CPU Bus
Interface Enable bit of Data Bus Buffer Control Register (bit 6 of
address 004A16) is “0”, these pins become the normal I/O ports.
When it is “1”, these pins become the master CPU bus interface
function pins.
Additionally, when using the master CPU bus interface function,
set port P6 to input mode by setting “0016” into its port direction
register (address 001516).
The selection of either the single data bus buffer mode, which
uses 1 byte: data bus buffer 0 only, or the double data bus buffer
mode, which uses 2 bytes: data bus buffer 0 and data bus buffer
1, is performed by the Data Bus Buffer Function Select Bit of Data
Bus Buffer Control Register 1 (bit 7 of address 004E16). Port P72
becomes S1 input pin in the double data bus buffer mode.
When data is written from the host CPU side, an input buffer full
interrupt occurs. When data is read from the host CPU, an output
buffer empty interrupt occurs. The 7641 group shares two input
buffer full interrupt requests and two output buffer empty interrupt
requests as shown in Figure 54, respectively.
The 7641 group can also operate the master CPU bus interface
connecting with the Built-in DMAC. This could transfer a large
amount of data fast.
An input signal level of data bus buffer function input pins can be
selected between a CMOS level and a TTL level. Set it using the
Master CPU Bus Input Level Select Bit of Port Control Register
(address 001016)
.
Input buffer
full flag 0
IBF0
Input buffer
full flag 1
IBF1
Rising edge
detection circuit
One-shot pulse
generating circuit
One-shot pulse
generating circuit
Input buffer full interrupt
request signal IBF
Output buffer
full flag 0
OBF0
Output buffer
full flag 1
OBF1
One-shot pulse
generating circuit
One-shot pulse
generating circuit
Output buffer empty interrupt
request signal OBE
Interrupt request is set at this rising edge
IBF0
IBF1
IBF
OBF0
(
OBE0)
OBF1
(
OBE1)
OBE
OBE0
OBE1
Rising edge
detection circuit
Rising edge
detection circuit
Rising edge
detection circuit
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