upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 74

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

10.3 Reset by Stack Pointer (with RESET Pin Internally Pulled Down)
down, and the program counter is reset to 0 (normally, the RESET pin is pulled up).
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.
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Program counter (PC)
Ports
Data memory (RAM)
Control registers
8-bit timer
Remote controller carrier
generator
Basic interval timer/watchdog timer counter
When the value of the stack pointer reaches 6H or 7H during program execution, the RESET pin is internally pulled
Therefore, if an interrupt or CALL instruction is executed when the value of the stack pointer is 0 (stack underflow)
Input/output
Output latch
General-purpose data memory
(Except DBF, port register)
DBF
System register (SYSREG)
WR
Counter (TMC)
Modulo register (TMM)
NRZ high-level timer modulo register (NRZHTMM) Retains previous
NRZ low-level timer modulo register (NRZLTMM)
Table 10-1. Status of Each Hardware After Reset
Hardware
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
Data Sheet U15002EJ1V1DS
0000H
Input
0
Retains previous
status
0320H
0
Retains previous
status
Refer to Figure 12-1 Register Files
00H
FFH
status
00H
RESET Input in
Standby Mode
0000H
Input
0
Undefined
0320H
0
Undefined
00H
FFH
Undefined
00H
During Operation
RESET Input