ace1502 Fairchild Semiconductor, ace1502 Datasheet - Page 24

• Manufacturer Part Number: ace1502
• Description: Arithmetic Controller Engine For Low Power Applications
• Manufacturer: Fairchild Semiconductor

ACE1502 Product Family Rev. 1.7
Figure 30. Programming Protocol
13. During in-circuit programming, G5 must be either not connected or driven high.
Figure 31. Serial Data Timing
11. Brown-out/Low Battery Detect Circuit
The Brown-out Reset (BOR) and Low Battery Detect (LBD)
circuits on the ACEx microcontroller have been designed to
offer two types of voltage reference comparators. The sections
below will describe the functionality of both circuits.
Figure 32. BOR/LBD Block Diagram
SHIFT_OUT (G2)
SHIFT_OUT (G2)
SHIFT_OUT (G2)
SHIFT_IN (G4)
(in write mode)
(in read mode)
CLOCK (G1)
SHIFT_IN (G4)
LOAD (G3)
CLOCK (G1)
RESET
VCC
Vcc
G4
BL[4]
1
7
1
10-bit Opcode = 0x34B
0
t
1
T
DIS
reset
Adjust Reference Voltage
BL[3]
0
6
0
1
Valid
t
ACCESS
t
0
DOS
t
HI
BL[2]
1
t
0
1
DIH
5
S
1
A: start of programming cycle
A
Valid
13
bit 31
BL[1]
4
t
t
DOH
LO
BL[0]
bit 30
3
32 clock pulses
+1.8V
Vref
24
VSEL
2
+
_
bit 0
+
_
LBD
BOR
X
1
t
load1
t
load2
LBD
0
2nd clock pulse
BUSY low by
Register
Control
LBD
BUSY
to RESET logic
t
ready
READY
t
load3
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t
load4
A
bit 31