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參數(shù)資料
| 型號(hào)： | UPD1724x |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁(yè)數(shù)： | 20/102頁(yè) |
| 文件大?。?/td> | 461K |
| 代理商： | UPD1724X |
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20
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
2.3
Stack
A stack is a register used to save a program return address and the contents of system registers (to be described
later) when a subroutine is called or when an interrupt is acknowledged.
2.3.1
Stack configuration
Figure 2-5 shows the stack configuration.
A stack consists of a stack pointer (a 4-bit binary counter, the highest bit fixed to 0), five 11-bit (
μ
PD17240)/12-
bit (
μ
PD17241)/13-bit (
μ
PD17242, 17243)/14-bit (
μ
PD17244, 17245, 17246) address stack registers, and three 6-
bit interrupt stack registers.
Figure 2-5. Stack Configuration
Address stack registers
(ASR)
b
11
b
10
b
9
b
8
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
Address stack register 1
Address stack register 2
Address stack register 3
Address stack register 4
b
2
b
1
b
0
SPb
2
SPb
1
SPb
0
Stack pointer
(SP)
0H
1H
2H
3H
4H
5H
6H
7H
0H
1H
2H
Interrupt stack registers
(INTSK)
BANKSK1
BANKSK2
BCDSK0
BCDSK1
BCDSK2
CMPSK0
CMPSK1
CMPSK2
CYSK0
CYSK1
CYSK2
ZSK0
ZSK1
ZSK2
IXESK0
IXESK1
IXESK2
Address stack register 0
The RESET pin is
internally pulled down
and reset is effected.
b
3
0
b
12
PD17241
μ
PD17242, 17243
μ
PD17244, 17245, 17246
μ
b
4
b
3
b
2
b
5
BANKSK0
b
1
b
0
Undefined
Undefined
Undefined
b
13
PD17240
μ
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