TMP89FS60 datasheet(52/410 Pages) TOSHIBA

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Page 38

2. CPU Core

2.4 Reset Control Circuit

TMP89FS60

RA001

2.4

Reset Control Circuit

The reset circuit controls the external and internal factor resets and initializes the system.

2.4.1

Configuration

The reset control circuit consists of the following reset signal generation circuits:

1. External reset input (external factor)

2. Power-on reset (internal factor)

3. Voltage detection reset 1 (internal factor)

4. Voltage detection reset 2 (internal factor)

5. Watchdog timer reset (internal factor)

6. System clock reset (internal factor)

7. Trimming data reset (internal factor)

8. Flash standby reset (internal factor)

Figure 2-14 Reset Control Circuit

2.4.2

Control

The reset control circuit is controlled by system control register 3 (SYSCR3), system control register 4

(SYSCR4), system control status register (SYSSR4) and the internal factor reset detection status register

(IRSTSR).

Note 1: The enabled SYSCR3<RSTDIS> is initialized by a power-on reset only, and cannot be initialized by an external reset input

or internal factor reset. The value written in SYSCR3 is reset by a power-on reset, external reset input or internal factor

reset.

Note 2: The value of SYSCR3<RSTDIS> is invalid until 0xB2 is written into SYSCR4.

System control register 3

SYSCR3

(0x0FDE)

76543

210

Bit Symbol

-----

(RVCTR)

(RAREA)

RSTDIS

Read/Write

RRRRR

R/W

After reset

00000

000

RSTDIS

External reset input enable register

0 : Enables the external reset input.

1 : Disables the external reset input.

P10(RESET)

Internal factor reset detection status register,

Voltage detection circuit reset signal

External reset input enable reset signal

Warm-up

counter reset

signal

System clock control circuit

Warm-up counter

CPU/peripheral

circuits reset signal

Flash standby reset signal

Trimming data reset signal

System clock reset signal

Watchdog timer reset signal

Voltage detection reset 2 signal

Power-on reset signal

P10 port

Voltage detection reset 1 signal

TMP89FS60 Datasheet(PDF) 52 Page - Toshiba Semiconductor

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