Power Supply; Rewriting Flash Memory; Drawer; Print Rate - Sharp XE-A40S Service Manual

XE-A40S
3. KEYSCAN MATRIX
CPU STO
MODE P90 SRV
Others P91 PF-R
4. DISPLAY
The XE-A40S has an LCD display, 5 x 7 dots, 2 lines, at the front side
and a 7-digit LED at the pop-up side.
FRONT:
POP UP:
• Display DIGIT signal
The above ST0 ~ ST6 are display digit signals.
ST0: 1st digit ~ ST6: 7th digit
• Display SEGMENT signal
The LED segment signal is outputted by writing SEGMENT data in
the /CS3 space.
Correspondence of DATA ~ SEGMENT
D0 ~ D6 → A ~ g
D7 → DP

[6] POWER SUPPLY

Measures should be taken to restore within 10 ms after a
power failure occurs..
TRANS.
/POFF detection point
[7] RE-WRITING FLASH MEMORY
IPL from EP-ROM: After IPL Short pin is set to VCC position the
program is started from EP-ROM by turning on
the power.
The program on EP-ROM is transferred to flash
ROM by switching the banks through S-RAM.

[8] DRAWER

The XE-A40S has a 1 drawer port. (No open sensor is provided.)
The driving time for the DRAWER solenoid are as follows: 50ms (max)
45ms (min)
ST1 ST2
PGM
PF-J RPE
24V
LM2574 +
ON/OFF CONTROL
(MODE SW)
PQ1CG2032
VLED
VCC 5.0V
VDD 5.0V
BATTERY
ST3 ST4 ST5
Time REG MGR
HEAD UP JPE

[9] PRINT RATE

384 dots/1 line

[10] A/D CONVERSION

The printer power supply voltage should be measured at more than 10
ms after the printer is turned ON.

[11] BUZZER

PIEZO type BUZZER
The oscillating frequency is 4.0kHz ± 0.5kHz

[12] USB I/F

The XE-A40S is equipped with 1 USB port (slave) as a standard provi-
sion. By use of the USB general-purpose ASSP device M66291
(RENESAS), it sends and receives USB data. The M66291 is mapped
to the /CS1 area (28000H ~ 3FFFFFH). The CPU and the M66291 are
connected as shown in the figure below.
CPU
5V
Vcc
A0
A1~A6
D0~D7
CS1
RD
WRL
WRH
INT2
INT1
/USBRST
<CPU Port>
Pin CPU PORT
No.
19 P83 (INT1)
18 P84 (INT2)
26 P74
Access from CPU to M66291 : 28000H + Register Address (00~77H)
Input clock uses 24MHz.

[13] RESET

The RESET signal is generated when:
1) The mode key switch is turned from SRV to a position other than
SRV'(excluding OFF).
2) The power is turned ON more than 10 seconds after the power is
turned OFF. (The reset signal may not be issued if the POWER-
OFF time is short.)
3) The mode key switch is turned from OFF to a position other than
OF (excluding the SRV position). (If the power-off time is less than
5 seconds, the reset signal may not be issued.)
4 – 5
ST6 ST7
X1/Z1 X2/Z2
DRAWER MRS RS/CI
OPEN
M66291
3.3V
IOVcc CoreVcc
D15/AD0
Vbus
AD1~AD6
7 TrON
1.5kΩ
D0~D7
8
CS
D+
RD
27Ω
LWR
D-
HWR/BYTE
27Ω
INT0
Dreq0
1.0{F
Xin Xout
24MHz
SIGNAL Application
/DREQUSE USB DMA CHANNEL 0 DMA
Request signal
/INTUSB USB Interrupt 0 Request signal
/USBRST USB reset signal
ST8 ST9
1
Vbus
3
D+
2
D-
4
GND
USB Connector