參數(shù)資料
型號(hào)： UPD784031YGC-3B9
廠商： NEC Corp.
英文描述： 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16-/8-bit的單晶片微控制器
文件頁數(shù)： 44/88頁
文件大小： 464K
代理商： UPD784031YGC-3B9
44
μ
PD784031Y
8.3 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 address is in a range of 0 to FFFFH.
Figure 8-1. Context Switching Operation when Interrupt Request is Generated
8.4 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 8-2. 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 to 16
PC15 to 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 n
(0 to 7)
(bits 8 through 11
of temporary register)
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