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| 型號： | UPD17244MC-xxx-5A4 |
| 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) |
| 文件頁數(shù)： | 74/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD17244MC-XXX-5A4 |
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Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
10.3 Reset by Stack Pointer (with RESET Pin Internally Pulled Down)
When the value of the stack pointer reaches 6H or 7H during program execution, the RESET pin is internally pulled
down, and the program counter is reset to 0 (normally, the RESET pin is pulled up).
Therefore, if an interrupt or CALL instruction is executed when the value of the stack pointer is 0 (stack underflow)
or if the stack level exceeds 6 as a result of execution of the RET instruction because the correspondence between
the CALL and RET instructions is not established (stack overflow), the program can be restarted from address 0H.
Table 10-1. Status of Each Hardware After Reset
Hardware
RESET Input in
Standby Mode
RESET Input
During Operation
Program counter (PC)
0000H
0000H
Ports
Input/output
Input
Input
Output latch
0
0
Data memory (RAM)
General-purpose data memory
(Except DBF, port register)
Retains previous
status
Undefined
DBF
0320H
0320H
System register (SYSREG)
0
0
WR
Retains previous
status
Undefined
Control registers
Refer to
Figure 12-1 Register Files
8-bit timer
Counter (TMC)
00H
00H
Modulo register (TMM)
FFH
FFH
Remote controller carrier
generator
NRZ high-level timer modulo register (NRZHTMM)
Retains previous
status
Undefined
NRZ low-level timer modulo register (NRZLTMM)
Basic interval timer/watchdog timer counter
00H
00H
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