tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 31

• Manufacturer Part Number: tmp88f846ug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.1.5 Reset Circuit
2.1.5.1
timer reset, system clock reset, voltage detect reset, power on reset and triming data reset.
reset) are not initialized.
which causes the device to enter a reset state. After the power-on warming-up time (tPOWUP) has elapsed, the
reset is released. For details, refer to the section on the power-on reset circuit.
Table 2-3 Internal Hardware Initialization by Reset Operation
The TMP88F846UG has seven 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
The power-on reset signal and trimming data reset signal are input to the power-on warming-up reset circuit,
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.
External Reset Input
The
When 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
(FFFFEH to FFFFCH)
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Not initialized
Initial Value
0
1
0
0
0
0
Page 21
RAM
Prescaler and divider for the
timing generator
Watchdog timer
Output latch of input/output port
Control register
Internal Hardware
Not initialized
See description of
each input/output
port.
See description of
each control
register.
Initial Value
Enable
0
RESET
TMP88F846UG
pin low for