參數(shù)資料
型號(hào)： μPD784218Y
廠(chǎng)商： NEC Corp.
英文描述： 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
中文描述： 8 / 16位單片機(jī)微控制器（8 / 16位單片微控制器）
文件頁(yè)數(shù)： 45/50頁(yè)
文件大?。?/td> 207K
代理商： ΜPD784218Y
50
μ
PD784217Y,784218Y
9.3 Context Switching
When an interrupt request is generated or when the BRKCS instruction is executed, a predetermined register
bank is selected by hardware. Context switching is a function that branches execution to a vector address stored
in advance in the register bank, and to stack the current contents of the program counter (PC) and program status
word (PSW) to the register bank.
The branch destination address is in a range of 0 to FFFFH.
Figure 9-1. Context Switching Operation When Interrupt Request Is Generated
9.4 Macro Service
This function is to transfer data between memory and a special function register (SFR) without intervention by
the CPU. A macro service controller accesses the memory and SFR in the same transfer cycle and directly transfers
data without loading it.
Because this function does not save or restore the status of the CPU, or load data, data can be transferred at
high speeds.
Figure 9-2. Macro Service
CPU
Memory
SFR
Macro service
controller
Read
Write
Write
Read
Internal bus
Register bank n (n = 0 to 7)
0000B
<7> Transfer
PC19-16
PC15-0
<6> Exchange
<5> Save
<2> Save
Temporary register
<1> Save
PSW
V
U
T
W
A
B
R5
R7
D
H
X
C
R4
R6
E
L
VP
UP
<3> Switching of register bank
(RBS0 to RBS2
←
n)
<4> RSS
←
0
IE
←
0
Register bank
(0 to 7)
(bits 8 through 11
of temporary register)
相關(guān)PDF資料
PDF描述
μPD784218 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
μPD784217 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
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