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參數(shù)資料
| 型號： | UPD784225 |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16/8-BIT單晶片微控制器 |
| 文件頁數(shù)： | 49/92頁 |
| 文件大小： | 687K |
| 代理商： | UPD784225 |
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49
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
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
Register bank n (n = 0 to 7)
0000B
<7> Transfer
PC19 to PC16
PC15 to PC0
<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)
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
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