tmp88cs43fg TOSHIBA Semiconductor CORPORATION, tmp88cs43fg Datasheet - Page 33

• Manufacturer Part Number: tmp88cs43fg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.1.5 Reset Circuit
2.1.5.1
2.1.5.2
timer reset and system clock reset.
reset) are not initialized.
Table 2-3 Internal Hardware Initialization by Reset Operation
The TMP88CS43FG has four ways to generate a reset: external reset input, address trap reset, watchdog
Table 2-3 shows how the internal hardware is initialized by reset operation.
At power-on time, the internal cause reset circuits (watchdog timer reset, address trap reset, and system clock
Program Counter (PC)
Stack Pointer (SP)
General-purpose Registers
(W, A, B, C, D, E, H, L)
Register Bank Selector (RBS)
Jump Status Flag (JF)
Zero Flag (ZF)
Carry Flag (CF)
Half Carry Flag (HF)
Sign Flag (SF)
Overflow Flag (VF)
Interrupt Master Enable Flag (IMF)
Interrupt Individual Enable Flag (EF)
Interrupt Latch (IL)
Interrupt Nesting Flag (INF)
at least three machine cycles (12/fc [s]) or more while the power supply voltage is within the rated operat-
ing voltage range and the oscillator is oscillating stably, the device is reset and its internal state is initial-
ized.
program beginning with the vector address stored at addresses FFFFCH to FFFFEH.
internal RAM,SFR or DBR area, the device generats an internal reset.
External Reset Input
Adress Trap Reset
The
When the
If the CPU should start looping for reasons of noise, etc. and attempts to fetch instructions from the
Internal Hardware
RESET
RESET
pin is a hysteresis input with a pull-up resistor included. By holding the
pin input is released back high, the device is freed from reset and starts executing the
RESET
Figure 2-12 Reset Circuit
(FFFFEH to FFFFCH)
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Initial Value
0
VDD
0
1
0
0
0
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Prescaler and divider for the
timing generator
Watchdog timer
Output latch of input/output port
Control register
RAM
Internal Hardware
Reset input
See description of
each input/output
port.
See description of
each control
register.
Not initialized
Initial Value
Enable
0
RESET
TMP88CS43FG
pin low for