Toshiba 21E88, Service Manual

Page: 39 / 68

SERVICE MANUAL
of functions work properly, so that designing the oscillation frequency accurately is required. The spec
of
crystal is recommended to be within
fosc: 8 MHz +/-20 ppm
ftemp: 8 MHz +/-40 ppm (-20°C to +65°C)
While RESET of MCU is active, the MCU function stops. Hardware and software initialization sequence
including power supplies control is required, because status of any hardware after the RESET period is
unknown especially horizontal oscillator which is a very basic timing generator of SP operation.
6).Terminal Interface
MCU Block
Table 8
Pin No. Pin Name Interface Ci I/O Function
1 P61/LED1/ADC 8 bit
(/KWU5)
(AIN5)
(LED1) I/O
(input)
(input)
(output)
Key on wake up input
A/D converter analog input
High current sink open drain output
2 P60/ADC 8 bit
(/KWU4)
(AIN4) I/O
(input)
(input)
Key on wake up input
A/D converter analog input
3 P53/ADC 8 bit/TC1/Int2
(/KWU0)
(AIN0)
(TC1)
(INT2) I/O
(input)
(input)
(input)
(input)
Key on wake up input
A/D converter analog input
Timer/counter input
External interrupt input
4 uP DVSS Power
Supply GND
5 /Reset I/O
Reset signal input or watchdog timer output
Address trap reset output
6
7 XOUT
XIN Output
Input X’tal connecting pins
8 TEST Input Test pin for out-going test.
Be tied to low.
9 uP DVDD
5 V
Power
Supply VDD
Supply 5 V
10 uP VVSS Power
Supply GND for Slicer circuit
54 uP
MPAGND
Power
Supply GND for
Oscillator circuit
(continued)
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